Volodymyr Zelenskiy is asking Western allies to speed up deliveries of air-defense systems and interceptor missiles to prepare for another winter of intense bombing that could prove to be the next critical moment in Kyiv’s battle to resist the Russian invasion.

Russian air defenses shot down 347 Ukrainian drones overnight, Russia’s Defense Ministry said Thursday, in what appeared to be a major attack after Moscow spurned Kyiv’s ceasefire earlier in the week and tension mounted over safety at Russia’s upcoming Victory Day celebrations.