Ukraine and its European allies will be meeting with top U.S. officials in London on Wednesday to discuss the proposals, which may not sit well with Kyiv.

Ukraine's military said on Wednesday it had hit a Russian long-range drone production site in Tatarstan, damaging the final assembly line. In the course of the three-year-old war, Russia has been extensively using Shahed and other types of attack drones for strikes across Ukraine.

President Volodymyr Zelenskiy said on Tuesday Ukraine was ready for talks with Russia "in any format" once a ceasefire is set, while the Financial Times reported President Vladimir Putin had offered to halt Russia's invasion at the current front lines.