Russian missile strikes on a Kyiv apartment building killed 24 people, triggering an official day of mourning in Ukraine.The assault coincided with a massive drone campaign and retaliatory Ukrainian strikes on the Russian city of Ryazan that resulted in four deaths.Concurrently, both nations executed a major prisoner swap involving 410 personnel while international leaders condemned the escalation of violence.These intensified military operations follow stalled peace talks and ongoing diplomatic discussions regarding the broader regional conflict.