LONDON — Ukraine and Russia continued to exchange cross-border drone attacks overnight into Wednesday morning, as Ukrainian President Volodymyr Zelenskyy and his team prepared to present their latest peace plan proposal to the U.S.

Russia’s Defense Ministry said its forces shot down at least 38 Ukrainian drones overnight into Wednesday. Among them were six drones shot down over the Moscow region, of which four were described as “flying toward” the capital.

Moscow Mayor Sergei Sobyanin said in posts to Telegram that emergency services had been dispatched to several sites where falling drone debris was reported.

Ukraine’s air force, meanwhile, said Russia launched 80 drones into the country overnight, of which 50 were shot down or suppressed. The air force reported impacts of 29 drones across seven locations. 

The latest exchanges came as Zelenskyy prepared a revised peace settlement proposal to be sent to the U.S. negotiating team on Wednesday. 

Key issues remain unsettled, including the fate of partially occupied Ukrainian regions in the east of the country and future security guarantees for Kyiv to deter repeated Russian aggression.

Zelenskyy told Ukrainian reporters during an online briefing on Tuesday evening that the delivery of the proposal had been delayed as Kyiv’s representatives were still working with European national security advisers on the proposal.

Zelenskyy also said that Russia’s continued strikes on Ukraine showed that Moscow is not genuine in its professed interest in securing a peace settlement.

Zelenskyy on Tuesday said Ukraine is ready to agree an “energy truce” with Russia, to pause attacks on energy infrastructure by both nations. 

Kremlin spokesperson Dmitry Peskov, though, on Wednesday dismissed the offer, telling reporters, “We are working towards peace, not a ceasefire,” as quoted by Russia’s state-run Tass news agency.

ABC News’ Yulia Drozd and Ellie Kaufman contributed to this report.