Zelenskyy vows to make battlefield 'more painful' for Russian forces after another day of deadly rocket strikes on UkraineThe Ukrainian leader said air defence was the "number one priority" after thousands of people spent Monday in bomb shelters as explosions erupted.Wednesday 12 October 2022 07:12, UKVolodymyr Zelenskyy was defiant as he vowed to make the battlefield "more painful" for Russian troops after another deadly day of rockets raining down on Ukraine.Vladimir Putin said the strikes were in retaliation for its "terrorist action" against Russian territory - the attack on the Kerch Strait Bridge in Crimea - but Ukraine has rejected this claim of "provocation".Former Ukrainian prime minister, Arseniy Yatsenyuk, told Sky News that "critical infrastructure" were among Russia's key targets in Monday's strikes and that Ukraine is expecting some blackouts as a result, putting hospitals in "jeopardy".Whoever was responsible, the attack is set to further squeeze Russian logistics and supply lines amid speculation that Kremlin forces will soon be down to their last supplies of fuel and unable to transport their troops."