"Starting from June 1, air ambulance units... will begin working round the clock on a trial basis. The special schedule for Moscow's air medical services will be in place until July 15," the mayor's office said in a statement published on its official website.

According to the statement, ambulance aircraft could continue operating 24 hours a day after the tournament is over if necessary.

 Moscow has a total of 31 helicopter landing platforms for three air ambulance units, which transport patients who have suffered a stroke or a heart attack or sustained serious injuries.

The 2018 FIFA World Cup will take place in Russia between June 14 and July 15.

Moscow's Luzhniky and Spartak stadiums will host a total of 12 World Cup matches, including eight group-stage games, two round of 16 matches, a semi-final and the final.