The Pentagon raised significant concerns about an aviation safety bill set to be taken up later on Monday by the U.S. House of Representatives, saying it could create "significant unresolved budgetary burdens and operational security risks affecting national defense activities."

Years before a deadly midair collision killed 67 people, the U.S. Army’s aging helicopters and inexperienced pilots had already raised alarms among local aviators.

Czech citizens united to crowdfund a UH-60 Black Hawk helicopter for Ukraine, raising €2.8 million through the volunteer campaign "A Gift for Putin."