Russian President Vladimir Putin and British Prime Minister Boris Johnson are scheduled to discuss the Ukraine situation by phone on Wednesday evening, Kremlin aide Yuri Ushakov said.

After Putin accused Washington of trying to provoke war, Russia mocked British Prime Minister as "utterly confused" and ridiculed British politicians for their "stupidity and ignorance," hurling more scorn at the West. 

The comments - caustic even by Moscow's increasingly defiant standards - demonstrated that, publicly at least, the Kremlin is in no mood to signal compromise in a stand-off with Western powers that accuse Russia of planning to invade Ukraine.

The Kremlin had earlier said it would provide details if and when Putin spoke to Johnson and that Putin was ready to talk to anyone, including the "utterly confused."

Putin and Johnson were meant to talk on Monday, but Johnson had to postpone due to domestic political problems. 
On Tuesday, along with Dutch Prime Minister Mark Rutte and his Foreign Minister Wopke Hoekstra, Johnson traveled to Kiev to meet with the Ukrainian president, where he accused Putin of holding a gun to Kiev's head in a bid to bully the West into redrawing the post-Cold War security map of Europe. 

Ushakov said the Kremlin hoped that Putin and Johnson would also discuss UK-Russia relations, which he said were at a very low level.

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(With input from agencies）