Putin vows to continue hitting Ukraine's power gridVladimir Putin has vowed to continue attacking Ukraine's energy infrastructure despite millions being left without electricity or water.But who started it?"Moscow has been battering Ukraine's power grid since 10 October, following a string of heavy military defeats.The country switched to emergency shutdowns to stabilise its power grid after a fresh wave of Russian missile attacks on Monday.Experts have told the BBC that Russia's tactic of hitting energy infrastructure is most likely designed to demoralise and terrorise the population, rather than gain any concrete military advantage - a move that would violate international law."