Ukraine's audacious targeting of major Russian airbases is "grounds for a nuclear attack," a prominent Kremlin propagandist and ally of Russia's President Vladimir Putin has said.

US President Donald Trump said Russian President Vladimir Putin told him “very strongly” in a phone call on Wednesday that he will respond to Ukraine’s weekend drone attack on Russian airfields. The US president said in a social media post that “it was a good conversation, but not a conversation that will lead to immediate peace.”