"Due to heightened political tensions between the UK and Russia, you should be aware of the possibility of anti-British sentiment or harassment at this time. If you’re currently in Russia or due to travel in the coming weeks, you're advised to remain vigilant, avoid any protests or demonstrations and avoid commenting publicly on political development," the Foreign Office said in a statement published on its official website.
The office noted that "the British Embassy in Moscow is not aware of any increased difficulties for British people traveling in Russia," but urged the UK fans to "follow the security and political situation closely and keep up to date with this travel advice."
England defeated Sweden 2-0 in the quarter-finals on Saturday and will next face Croatia at Moscow's Luzhniki Stadium on Wednesday.
The 2018 FIFA World Cup kicked off on June 14 and will continue until July 15, with the final set to be played at the Luzhniki Stadium.