President Donald Trump is frustrated with Russia and Ukraine and could instruct his administration to pull out of peace talks.

The Kremlin said on Friday that some progress had already been made in talks about a possible peace settlement to end the war in Ukraine but that contacts were rather complicated with the United States.

The statement added that the aircraft are designed to destroy ground and air targets, and infrastructure facilities covered by air defense systems. Izvestia reported how on March 31, a Su-34 aircraft had bombed a Ukrainian stronghold in the border area of Russia's Kursk region.