The U.N. Human Rights Monitoring Mission in Ukraine said in a report published Thursday that short-range drone attacks killed at least 395 civilians and injured 2,635 between the start of the war and last April. Almost 90% of the attacks were by the Russian armed forces, it reported.

Russia and Ukraine exchanged more long-range drone attacks that have become a staple of the more than three-year war, officials said Friday, as Russian President Vladimir Putin said Moscow is ready for a fresh round of direct peace talks in Istanbul.

President Vladimir Putin said on Friday that Russia was ready to hold a new round of peace negotiations with Ukraine, potentially in Istanbul, although the time and venue had yet to be agreed. Putin said there were big differences between the proposals submitted by the two sides at previous talks but expressed hope that continued dialogue would help narrow the gap.