Russia declared a three-day ceasefire in Ukraine starting May 8 for the anniversary of the Soviet Union's victory over Nazi Germany. Ukraine called for an immediate, 30-day truce instead.

The U.S. is showing signs that it is increasingly willing to withdraw from a peace process that has grown more complex in recent months.

A roundup of key developments and the latest in-depth coverage of Russia's invasion of Ukraine.

The historic negotiations represent the first direct talks between the long-warring sides. However, leaders warn that reaching a peace deal could take time.