There was a stony silence in Moscow a day after President Donald Trump signalled he had lost his patience with Russian President Vladimir Putin.

Russia launched a large-scale air attack on Ukraine early Wednesday, causing power outages across most of the country, setting homes ablaze and killing at least six people, including a six-month-old baby,

Russian President Vladimir Putin has directed drills of the country’s strategic nuclear forces that featured practice missile launches.

The Kremlin stressed on Wednesday that the dates for the face-to-face talks, due to take place in Hungary, "weren't set" and that this would still happen.

At least six people were killed overnight shortly after President Donald Trump said he didn't "want to have a waste of time" holding a summit with the Russian leader.

Russia’s strategic nuclear forces carried out a readiness test supervised by the country’s President Vladimir Putin on Wednesday, the Kremlin said.

As Trump's plan to meet Putin is called off, Zelenskyy says another bloody night in Ukraine shows Russia isn't feeling "enough pressure for dragging out the war."

The drone and missile attacks on Ukraine came as the US president put on hold his plans for an imminent summit in Budapest.