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But in recent weeks, the relationship has begun to show signs of strain.

Trump called Putin 'crazy' over the weekend and said May 27 he's 'playing with fire' as he continues to bombard Ukraine during peace negotiations.

The White House faces the question of whether its appeasement of Russia has failed to achieve the ceasefire it promised and instead emboldened the Kremlin on the battlefield.

A top Kremlin aide has accused Donald Trump of being “not sufficiently informed” about the situation in Ukraine after the US president said Russian leader Vladimir Putin was “playing with fire.”

A Russian official said "Trump is not being sufficiently informed about what is really happening in the context of the Ukrainian-Russian confrontation."

Hundreds of Ukrainian drones crossed into Russia overnight into Wednesday morning, dozens of which targeted Moscow.