President Vladimir Putin on Thursday threatened to strike "decision-making centres" in Kyiv with Russia's new hypersonic missile, hours after Moscow pummelled Ukraine's energy grid in an attack that left a million people without power.

Kyiv is heavily protected by air defences, but Putin says the Oreshnik, which Russia fired for the first time at a Ukrainian city last week, is incapable of being intercepted - a claim greeted with scepticism by Western experts.

It comes as Russia’s second big aerial attack on Ukraine’s energy system this month leaves one million people without power