Sen. John McCain on Tuesday issued a strongly worded statement warning President-elect Donald Trump not to trust overtures of peace from the Kremlin and to be cautious of supposed attempts to strengthen U.S.-Russian ties.
"With the U.S. presidential transition underway, Vladimir Putin has said in recent days that he wants to improve relations with the United States," McCain said. "We should place as much faith in such statements as any other made by a former KGB agent who has plunged his country into tyranny, murdered his political opponents, invaded his neighbors, threatened America's allies, and attempted to undermine America's elections."
Related: Putin through the years
Russian President Vladimir Putin takes a seat before a meeting to mark International Women's Day, in Moscow's Kremlin, Russia, Tuesday, March 8, 2016. (Alexei Druzhinin/Sputnik Kremlin Pool Photo via AP)
Russian President Vladimir Putin holds a glass of champagne after a state awards ceremony at the Kremlin in Moscow, on March 10, 2016. AFP PHOTO / POOL / PAVEL GOLOVKIN / AFP / POOL / PAVEL GOLOVKIN (Photo credit should read PAVEL GOLOVKIN/AFP/Getty Images)
MOSCOW, RUSSIA. MARCH 1, 2016. Russia's president Vladimir Putin at the 7th congress of the Chamber of Commerce and Industry of the Russian Federation (CCI). Mikhail Metzel/TASS (Photo by Mikhail Metzel\TASS via Getty Images)
Russian President Vladimir Putin waves as he leaves the Italian pavilion at the 2015 Expo, in Rho, near Milan, Italy, Wednesday, June 10, 2015. Putin was meeting Wednesday with Italian officials and Pope Francis as the U.S. sought to encourage the Vatican to join the West in condemning Moscow's actions in Ukraine. (AP Photo/Luca Bruno)
Pope Francis meets Russian President Vladimir Putin on the occasion of a private audience at the Vatican, Wednesday, June 10, 2015. (AP Photo/Gregorio Borgia, Pool)
Russian President Vladimir Putin, center, flanked on his right by Italian Premier Matteo Renzi, waves as he leaves after visiting the Russian pavilion at the 2015 Expo in Rho, near Milan, Italy, Wednesday, June 10, 2015. Putin was meeting Wednesday with Italian officials and Pope Francis as the U.S. sought to encourage the Vatican to join the West in condemning Moscow's actions in Ukraine. (AP Photo/Luca Bruno)
Russian President Vladimir Putin smiles during a meeting with foreign ministers of the Shanghai Cooperation Organization in Moscow, Russia, Wednesday, June 3, 2015. (AP Photo/Pavel Golovkin, Pool)
Russian President Vladimir Putin (R) and Defence Minister Sergei Shoigu leave Moscow's Red Square on May 9, 2015 after the Victory Day military parade. Russian President Vladimir Putin presides over a huge Victory Day parade celebrating the 70th anniversary of the Soviet win over Nazi Germany, amid a Western boycott of the festivities over the Ukraine crisis. AFP PHOTO / KIRILL KUDRYAVTSEV (Photo credit should read KIRILL KUDRYAVTSEV/AFP/Getty Images)
Russian President Vladimir Putin, right, and German Chancellor Angela Merkel meet in the Kremlin in Moscow, Russia, Sunday, May 10, 2015. Angela Merkel attended a wreath-laying ceremony at the Tomb of the Unknown Soldier, marking the 70th anniversary of the defeat of the Nazis in World War II, in Moscow. (Sergei Karpukhin/Pool Photo via AP)
Russian President Vladimir Putin, left, and Defence Minister Sergei Shoigu, right, attend a wreath-laying ceremony at the Tomb of the Unknown Soldier in Moscow, Russia, Monday, Feb. 23, 2015. The Defenders of the Fatherland Day, celebrated in Russia on Feb. 23, honors the nation's military and is a nationwide holiday. (AP Photo/Pavel Golovkin)
Russian President Vladimir Putin gestures as he speaks to the media after the peace talks in Minsk, Belarus, Thursday, Feb. 12, 2015. Russian President Vladimir Putin on Thursday emerged from marathon Ukraine peace talks by announcing a new cease-fire deal, but questions remained whether Ukraine and the pro-Russian rebels have agreed on its terms. (AP Photo/Alexander Zemlianichenko, Pool)
German Chancellor Angela Merkel, left, and Russian President Vladimir Putin attend a wreath-laying ceremony at the Tomb of the Unknown Soldier in Moscow marking the 70th anniversary of the defeat of the Nazis in World War II, in Moscow, Russia, Sunday, May 10, 2015. (AP Photo/Alexander Zemlianichenko)
Russian President Vladimir Putin (R) speaks with the leader of Georgia's breakaway province of South Ossetia Leonid Tibilov during a meeting at the Kremlin in Moscow on June 1, 2015. AFP PHOTO / POOL / IVAN SEKRETAREV (Photo credit should read IVAN SEKRETAREV/AFP/Getty Images)
Russian President Vladimir Putin smiles, during his meeting with Kyrgyz President Almazbek Atambayev in the Konstantin Palace outside St. Petersburg, Russia, Monday, March 16, 2015. Putin resurfaced Monday afterÂ a 10-day absence from public view, looking healthy. (AP Photo/Anatoly Maltsev, Pool)
Russian President Vladimir Putin, left, enter a hall for a meeting of CSTO (Collective Security Treaty Organization) in Moscow's Kremlin, Russia, Tuesday, Dec. 23, 2014.(AP Photo/RIA Novosti, Alexei Druzhinin, Presidential Press Service)
Russian President Vladimir Putin gestures during his annual news conference in Moscow, Russia, Thursday, Dec. 18, 2014. The Russian economy will rebound and the ruble will stabilize, Russian President Vladimir Putin said Thursday at his annual press conference, he also said Ukraine must remain one political entity, voicing hope that the crisis could be solved through peace talks. (AP Photo/Pavel Golovkin)
Russian President Vladimir Putin, center, gestures during his talks with German Chancellor Angela Merkel, left, and French President Francois Hollande, right, in Moscow, Friday, Feb. 6, 2015. In a top-level diplomatic dash, French President Francois Hollande and German Chancellor Angela Merkel flew to Moscow on Friday to seek a cease-fire and then a lasting peace for war-wracked eastern Ukraine. (AP Photo/Alexander Zemlianichenko)
BUDAPEST, HUNGARY - FEBRUARY 17: Russian President Vladimir Putin (C) looks on as Hungarian Prime Minister Viktor Orban kisses the hand of a member of the Russian delegation during a signing ceremony of several agreements between the two countries on February 17, 2015 in Budapest, Hungary. Putin is in Budapest on a one-day visit, his first visit to an EU-member country since he attended ceremonies marking the 70th anniversary of the D-Day invasions in France in June, 2014. (Photo by Sean Gallup/Getty Images)
Russian President Vladimir Putin (R) meets with Iraqi Prime Minister Haider al-Abadi at the Kremlin in Moscow on May 21, 2015. AFP PHOTO / POOL / KIRILL KUDRYAVTSEV (Photo credit should read KIRILL KUDRYAVTSEV/AFP/Getty Images)
SOCHI, RUSSIA - MARCH 16: Russia President Vladimir Putin waves during the Sochi 2014 Paralympic Winter Games Closing Ceremony at Fisht Olympic Stadium on March 16, 2014 in Sochi, Russia. (Photo by Dennis Grombkowski/Getty Images)
The Arizona Republican, once a presidential hopeful himself and now chairman of the powerful Senate Armed Services Committee, issued the statement after news that Trump and Putin had spoken by telephone and agreed to bolster the relationship between their countries.
The statement comes as Russia has reportedly stepped up airstrikes in Syria as part of what appears to be a renewed offensive to retake the city of Aleppo. Following Moscow's continued deployments of military might to the region, McCain said the warming of relations must stop.
McCain also blasted President Barack Obama for his failed "reset" policy carried out by then-Secretary of State Hillary Clinton, Trump's unsuccessful Democratic opponent in the presidential race. He said it cleared the way for Russia's annexation of Crimea – which the U.S. considers illegal – and ongoing military operations it supports in eastern Ukraine, as well as its continued intervention in the Middle East in support of Syrian President Bashar Assad.
Related: McCain through the years
John McCain through the years
John McCain through the years
20th August 1992: The Republican Senator from Arizona, John McCain, speaking at the Republican National Convention. A fomer prisoner of war for several years in Vietnam, he contested his party's nomination for the 2000 election. (Photo by Consolidated News Pictures/Getty Images)
HANOI, VIET NAM: U.S. Sen. John McCain, a former POW, looks 31 May 1993 at a display of personal belongings of American POWs at the joint POW/MIA archives center in the Hanoi Army Museum. McCain is with U.S. Sen. John Kerry and a delegation on a two-day visit aimed at obtaining more access to archives dealing with the fate of missing U.S. servicemen. (Photo credit should read HOANG DINH NAM/AFP/Getty Images)
UNITED STATES - FEBRUARY 27: TV RATINGS--Senate Commerce Committee Chairman John McCain, R-Ariz., during hearing on the TV ratings system. (Photo by Douglas Graham/Congressional Quarterly/Getty Images)
UNITED STATES - MAY 18: MCCAIN'S DAY--Sen John McCain, R-Ariz., relaxes in his office at about 2:15 p.m. (Photo by Scott J. Ferrell/Congressional Quarterly/Getty Images)
UNITED STATES - JUNE 02: McCAIN BILL--John McCain,R-Ariz.,during a press conference on the McCain Bill and tobacco legislation. (Photo by Douglas Graham/Congressional Quarterly/Getty Images)
WASHINGTON, : US Senator John McCain, R-AZ, chairman of the Senate Committee on Commerce, Science and Transportation begins the start of a hearing on the investigation of the scandal surrounding the 2002 Salt Lake City Winter Olympics on Capitol Hill in Washington, DC 14 April, 1999. AFP PHOTO/Mario TAMA (Photo credit should read MARIO TAMA/AFP/Getty Images)
HANOVER, : US Senator John McCain speaks to reporters 27 October,1999 in Hanover, New Hampshire. McCain criticized sugar, oil, and corn (shown behind) subsidies and linked them to 'soft money' campaign contributions. (ELECTRONIC IMAGE) AFP PHOTO Luke FRAZZA (Photo credit should read LUKE FRAZZA/AFP/Getty Images)
MANCHESTER, : Republican president hopeful John McCain greets supporters as he arrives at a debate forum sponsored by a local television station 02 December, 1999, in Manchester, New Hampshire. McCain will debate the other Republican candidates seeking the party's presidential nomination. (DIGITAL IMAGE) AFP PHOTO/John MOTTERN (Photo credit should read JOHN MOTTERN/AFP/Getty Images)
UNITED STATES - CIRCA 2000: John McCain addresses a shadow convention at the Annenberg Center of the University of Pennsylvania. McCain was booed when he asked suppoters to back his former primary opponent, George W. Bush. The shadow convention was put on near the site of the Republican National Convention in Philadelphia to highlight issues that the organizers say the major parties are ignoring. (Photo by Harry Hamburg/NY Daily News Archive via Getty Images)
CAMDEN, UNITED STATES: GOP presidential hopeful US Senator John McCain (R-AZ) waves during an 'Old Fashion BBQ and Stump Meeting' on the front yard of a supporter's house 08 January 2000 in Camden, South Carolina. (ELECTRONIC IMAGE) AFP PHOTO/Paul J. RICHARDS (Photo credit should read PAUL J. RICHARDS/AFP/Getty Images)
PETERBOROUGH, NH - JANUARY 30: Republican presidential hopeful Sen. John McCain (L) and his wife Cindy are showered with confetti following McCain's final town meeting 30 January, 2000 in Peterborough, New Hampshire. (ELECTRONIC IMAGE) (Photo credit should read C.J. GUNTHER/AFP/Getty Images)
GREENWOOD, : Republican presidential hopeful John McCain makes a point 14 February 2000 during a town hall meeting at the American Legion Post 20 in Greenwood, South Carolina. McCain is campaigning heavily in the southern state against Texas Governor Geroge W. Bush ahead of the 19 February 2000 primary. (ELECTRONIC IMAGE) AFP PHOTO/Tim SLOAN (Photo credit should read TIM SLOAN/AFP/Getty Images)
THE TONIGHT SHOW WITH JAY LENO -- Episode 1789 -- Pictured: (l-r) Senator John McCain during an interview with host Jay Leno on March 1, 2000 -- (Photo by: Paul Drinkwater/NBC/NBCU Photo Bank via Getty Images)
UNITED STATES - APRIL 30: Sen. John McCain, R-AZ, at a Senate Commerce, Science and Transportation Committee hearing on climate change. (Photo By Tom Williams/Roll Call/Getty Images)
** FILE ** In this Feb. 11, 2002 file photo, a bandaged Sen. John McCain, R-Ariz., takes part in a Washington news conference. Three-time melanoma survivor McCain appears cancer-free, has a strong heart and is in otherwise general good health, according to eight years of medical records reviewed by The Associated Press. (AP Photo/Stephen J. Boitano, File)
Sen. John McCain, R-Ariz., speaks to supporters during a speech at a fund-raider Thursday, Feb. 20, 2003, in Phoenix. McCain committed to his re-election campaign Thursday by telling supporters that he wants to continue helping the nation when it faces a struggling economy and unpredictable foreign enemies. (AP Photo/Tom Hood)
En route to Las Vegas, Nev., President Bush, joined by Sen. John McCain R-Ariz, right, talks to reporters on Air Force One about his final campaign push on the morning after his final debate, Thursday, Oct. 14, 2004. (AP Photo/J. Scott Applewhite)
UNITED STATES - FEBRUARY 12: TEMPORARY GUEST WORKERS--Witness Sen. John McCain, R-Ariz., during the Senate Judiciary Immigration, Border Security and Citizenship Subcommittee hearing titled 'Evaluating a Temporary Guest Worker Proposal.' (Photo by Scott J. Ferrell/Congressional Quarterly/Getty Images)
UNITED STATES - JUNE 28: SENATE POLICY LUNCHES--Sen. John McCain, R-Ariz., talks to reporters after the Senate GOP policy luncheon. (Photo by Scott J. Ferrell/Congressional Quarterly/Getty Images)
WASHINGTON - SEPTEMBER 20: U.S. Senator John McCain (R-AZ) addresses The Northern Virginia Technology Council's Titans breakfast at the Capitol Hilton September 20, 2006 in Washington, DC. McCain spoke on a variety of subjects, including telecommunications legislation, net neutrality, research and development tax credits, immigration, and Internet taxes. He also addressed the rift that he and several other Republican senators are having with the White House over the Geneva Conventions. (Photo by Chip Somodevilla/Getty Images)
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"At the very least, the price of another 'reset' would be complicity in Putin and Assad's butchery of the Syrian people," McCain said. "That is an unacceptable price for a great nation. When America has been at its greatest, it is when we have stood on the side those fighting tyranny. That is where we must stand again."
The Pentagon has decried Russia's involvement in Syria as "unhelpful" since it first deployed troops there last year. Its aircraft carrier the Adm. Kuznetsov arrived off the Syrian coast last week to supplement the roughly 24 strike aircraft Russia already has at an air base it built in Latakia last year. Moscow has claimed it will use the carrier and its aircraft and weapons on board to begin an intensification of its assault.
A Defense Department spokesman on Tuesday claimed the deployment is, at this point, merely showing off.
"There is nothing kinetically that they can achieve or want to achieve they can't already do with the forces that are already there," Navy Capt. Jeff Davis said, citing the Kuznetsov, as well as cruise missiles launched from ships and long-range bombers flown from Russia. "These are done for show."