According to him, the world is entering an era of multipolarity.

“Here I would mention Russia, which, from our point of view, poses a serious threat,” Carter said at the Center for a New American Security.

He added that China is a "chronic systemic challenge" for Britain.

Earlier, the Russian Foreign Ministry, commenting on NATO's actions to revoke accreditation from employees of the Russian permanent mission to the alliance, said that NATO's line towards Moscow is becoming more and more aggressive.