With uncertainty across the Atlantic, Europe worries about its own security

FILE - Italian Air Force Eurofighter Typhoon military fighter jets participate in NATO's Baltic Air Policing Mission operate in Lithuanian airspace, on Sept.12, 2023. FILE - NATO country members flags wave at NATO headquarters in Brussels, on Nov. 28, 2023.

When Donald Trump suggested during the 2016 presidential campaign that he might not honor a U.S. commitment to defend other NATO countries if they were attacked, it triggered alarm throughout the trans-Atlantic alliance.