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.

Ukraine was jubilant on June 1 as news filtered through of a stunning drone attack targeting Russian heavy bombers, that simultaneously targeted four air bases, two of them thousands of miles inside Russia.

Ukraine unleashed more than a hundred drones smuggled deep into Russia in what it called its most damaging attack yet.

Ukraine said on Tuesday that it had hit the bridge connecting Russia and the occupied Crimean Peninsula with explosives planted underwater, in its third attack on the vital supply line for Moscow’s forces since the full-scale war began in 2022.

At least seven people were killed and 27 injured across Ukraine overnight into Tuesday as Russia continued long-range attacks on cities, local officials said.