Russia warned it would retaliate against the U.K. Russia's foreign ministry said it's also closing the British Consulate General in St. Petersburg and the British Council in Russia.
The measures come amid fallout over an attack on a former double agent and his daughter in southern England. U.K. Prime Minister Theresa May said it is "highly likely" Russia was behind the nerve agent attack.
Russia's foreign ministry made clear booting the diplomats is a direct response to what it says are "groundless accusations." The U.K. diplomats have a week to leave.
Related: Putin through the years
Vladimir Putin through the years
Vladimir Putin through the years
P362575 05: A class photo with Vladimir Putin, (fourth row, second from left) dated 1966 in St. Petersburg, Russia. (Photo by Laski Diffusion)
368975 01: (AMERICAS ONLY) FILE PHOTO: Russian President Vladimir Putin, right, poses for a photograph in this file photo with his parents Maria and Vladimir Putin in1985 just before his departure to Germany. Putin was sworn in as Russia''s second democratically elected president May 7, 2000, pledging to restore Russia as a great power. (Photo by Laski Diffusion/Newsmakers)
ITAR-TASS: LENINGRAD, USSR. Vladimir Putin seen with his wife Lyudmila and daughter Maria. File photo from family archive was taken in spring 1985. (Photo ITAR-TASS) (Photo by TASS via Getty Images)
St, petersburg mayor anatoly sobchak and austrian chancellor's wife christine vranitzky during a ceremony to name 'austria square' in downtown st, petersburg, austria has pledged to restore the square, future president of russia, vladimir putin, looks on, far left, september 1992. (Photo by: Sovfoto/UIG via Getty Images)
President George Bush meets with President Vladimir Putin at the Catherine Palace in St. Petersburg. Bush was meeting with Putin to thank him for signing the UN resolution demanding disarmament of Iraq. (Photo by ?? Brooks Kraft/CORBIS/Corbis via Getty Images)
KRASNODAR, RUSSIA: Russian acting President Vladimir Putin (L) talks to a boy (R) during his visit to the Children's regional clinic hospital in Krasnodar 11 February 2000. Putin arrived in Krasnodar for a two-day visit to take a part in the All Russia Conference on emergency measures to stabilise and develop the Russian agro-industrial complex. (ELECTRONIC IMAGE) (Photo credit should read SERGEI CHIRIKOV/AFP/Getty Images)
Uzbek president islam karimov helping rf president vladimir putin put on a traditional robe, uzbekistan, december 1999. (Photo by: Sovfoto/UIG via Getty Images)
President George W. Bush and First Lady Laura greet President Vladimir Putin and his wife Lyudmila outside of the Catherine Palace in St. Petersburg. Bush was meeting with Putin to thank him for signing the UN resolution demanding disarmament of Iraq. (Photo by ?? Brooks Kraft/CORBIS/Corbis via Getty Images)
MADRID, SPAIN - JANUARY4: Russian President Vladimir Putin (R) and Spanish Prime Minister Jose Maria Aznar (L) pose with their wives Ludmila Putin (2nd L) and Ana Botella before their lunch at Moncloa Palace June 14. Putin said he had no reason to believe the arrest of media magnate Vladimir Gusinsky was politically motivated but vowed to examine the case, which has stirred stormy protest in Moscow. (Photo credit should read SERGEI KARPUKHIN/AFP/Getty Images)
(GERMANY OUT) Vladimir Putin - Politician, Mayor St. Petersburg, Russia - signs an agreement about the marketing of inventions. Second Mayor and Senator of Economics of Hamburg Hans-Juergen Krupp (right) (Photo by Ambor/ullstein bild via Getty Images)
Moscow, russia, outgoing russian president boris yeltsin (r) shaking hands with russian prime minister and acting president vladimir putin (l) as he leaves moscow's kremlin, the seat of russian power,1999. (Photo by: Sovfoto/UIG via Getty Images)
Russian prime minister vladimir putin seen casting his vote during the elections to the state duma, at the polling station #2026 in moscow's kosygina street,moscow, russia, december 19, 1999. (Photo by: Sovfoto/UIG via Getty Images)
N362234 01: (FILE PHOTO) Russian Prime Minister Vladimir Putin visits Uzbekistan President Islam Karimov on August 16, 1999. President Boris Yeltsin announced on national television Friday, Dec. 31, 1999 that he had resigned and presidential elections will be held within 90 days to replace him. Yeltsin said he was stepping down immediately because he wanted Putin to succeed him. Putin, the country's most popular politician, immediately took control of the government and will serve as acting president until the elections. (photo by Laski Diffusion/Liaison Agency)
SEVEROMORSK, RUSSIA - APRIL 7: Russian President-elect Vladimir Putin watches the tactical exercises of Russia's Northern Fleet in the Barentsevo Sea, 06 April 2000. Vladimir Putin spent the night underwater in a nuclear submarine near the Arctic Circle. (Photo credit should read AFP/AFP/Getty Images)