“We are always aware that Russia will react aggressively,” RIA Novosti quotes him.

O'Brien shared his fears that the corresponding move by Washington could negatively affect the agreements reached on the export of Ukrainian grain.

Earlier, US Senators Richard Blumenthal and Lindsey Graham again called on the US administration to recognize Russia as a state sponsor of terrorism.

The State Department warned the US Congress about the problems if Russia is recognized as a “country sponsor of terrorism.”

Russian Foreign Ministry spokeswoman Maria Zakharova said that bilateral Russian-American relations could be forgotten if the United States declared Russia a "sponsor of terrorism."