Moscow is running low on beer due to high demand from World Cup fans in Russia

This is a giant red flag.

It’s not even one week into the tournament, but World Cup fans are partying so hard in Moscow that the capital of host country Russia is running low on beer.

Numerous restaurants and bars close to Red Square and the Kremlin are nearly tapped. And worse, getting more beer from suppliers is taking longer than usual, according to Reuters.

"We just didn't think they would only want beer," a waiter at an upscale joint in the city told Reuters. “There are really a lot of people in Moscow ... and they are all drinking."

Even the suppliers are having trouble getting beer, as the waiter explained the restaurant they work at ran out of it on Monday and have had to wait more than 24 hours to get restocked.

The shortage may be a direct result of a decade-long trend in Russia.

Beer sales in the country have dipped by nearly a third in the past 10 years, because of increased regulations on duties and advertising.

With the massive increase in people flocking to the country this month for the World Cup, many establishments may not have expected so many to be beer lovers.

Lucky for the bars that are close to running dry, as the month goes on fewer teams remain in the tournament, which will likely result in fans exiting the country.