Western countries have done their utmost to prepare Ukraine for its counteroffensive, so Washington is optimistic, US President Joe Biden said on Thursday at a press conference with British Prime Minister Rishi Sunak.

Moscow told Washington on Wednesday to keep well away from its air space after a U.S. drone intercepted by Russian jets crashed into the Black Sea - the first known direct confrontation between the superpowers since Russia invaded Ukraine.

Iranian Foreign Minister Hossein Amirabdollahian said on Sunday that his country and the United States have reached an agreement on extradition of prisoners.

The United States has halted any area of cooperation with Moscow, and Washington does not talk about stabilizing relations with Russia, Ambassador to the US Anatoly Antonov said in a televised interview with Russia’s Channel One on Wednesday.