Moskva asked 10 US diplomats to leave Russia before May 21, responding to Washington's similar move.

Last week, the US expelled 10 Russian diplomats to retaliate against Russian American election intervention, behind the large-scale network attack and other hostile activities.

On April 21, Moscow announced that 10 US diplomats in Russia were declared as "people who are not welcome".

The US Embassy in Moskva.

"This measure is the response to the US hostile actions for some employees of the Russian Embassy in Washington and the Russian Consulate General in New York", claiming to write.

Russian - Western relations recently stressed about issues such as Russian opposition leaders Alexei Navalny were detained, Russia strengthened forces near the Ukrainian border and a spy scandal.

The Russian Foreign Ministry also warned the "future steps" to respond to US sanctions imposed last week.

In the federal message speech on April 21, Russian President Putin warned Western opponents should not overcome the Kremlin's "red line" and criticize these countries to blame everything for Moskva.