About 2,400 Russian nationals are fighting with Daesh militants, Sputnik cited Russia's First Deputy Director of Federal Security Sergei Smirnov as saying on Friday.

Speaking to journalists, Smirnov said that the problem of migrants fleeing the Middle East to Europe is only likely to increase, posing potentially a "great threat" for Russia.

Hinting at the United States, Smirnov said that there are "some countries that try to evade" international cooperation on fighting terrorism.

Source: MENA