Russian President Vladimir V. Putin said the attacks were a response to Ukraine’s hitting Russian territory with U.S.-made long-range missiles 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.

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