What does Trump's election victory mean for NATO, Europe?

FILE - Then-U.S. President Donald Trump, then-NATO Secretary General Jens Stoltenberg, center half hidden, and then-British Prime Minister Boris Johnson, right, participate in a NATO leaders meeting in Watford, U.K., on Dec. 4, 2019. FILE - Republican presidential nominee and former President Donald Trump meets with Ukrainian President Volodymyr Zelenskyy in New York on Sept. 27, 2024.

America's allies in Europe are debating what Donald Trump's win in Tuesday's U.S. presidential election could mean for their security and prosperity amid concerns that the next four years may once again be characterized by a turbulent transatlantic alliance.