Russian firefighters have succeeded in pushing back wildfires while an advancing cold front is expected to finally put an end to a two-month heat wave, officials said yesterday.

There were 500 blazes still burning, but the amount of land on fire was down 15 percent in the 24 hours, the Emergency Situations Ministry said. The area covered by fires around Moscow has nearly halved in size over the past two days.

The heat wave - unprecedented in 130 years of record keeping - has sparked thousands of fires, most of them in western Russia.

The heat and acrid smog from the fires that blanketed Moscow for a straight week earlier this month have doubled the number of recorded deaths there.

More than 50 people have died in the wildfires across Russia, and more than 2,000 homes have been destroyed.

Meteorologists say that a cold front advancing from the northwest will hit the Moscow region later yesterday, bringing heavy rains and colder temperatures.

The heat wave has raised concerns that wildfires could spread to areas contaminated by the 1986 Chernobyl nuclear disaster and spread radioactive particles over broader territory.

The authorities have insisted that all wildfires in the Bryansk region and other Chernobyl-affected areas have been quickly dealt with.

Officials said they are well equipped to combat blazes.