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.

President Vladimir Putin has threatened to target Kyiv's "decision-making centres" with a new ballistic missile. Questions have been raised about its potential impact and speed after it was used to attack the Ukrainian city of Dnipro last week.

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.