Russia and Ukraine are meeting in Istanbul on Monday for a second round of direct negotiations, a day after Ukraine launched an unprecedented drone attack targeting Russian military bases thousands of miles from the front lines.

Ukraine and Russia agreed to another large-scale prisoner swap but little else during a second round of direct peace talks that lasted just over an hour as air attacks by both sides continue in Europe's largest and deadliest conflict since World War II.

Ukraine’s asymmetric drone attack caught the world’s attention and dealt a significant blow to Russia’s defense. Peace prospects may hinge on how Vladimir Putin and Donald Trump respond.