A United States that abruptly changes its strategy every four years is not one other countries will trust or respect.

US allies in Europe are worried that American support for Ukraine is fickle, and that the Trump administration will cut its ...

After Trump sends advanced weapons to Ukraine, Russia warns its nuclear policy is active, raising global tension over NATO's ...

Most NATO allies promised to ramp up defense spending and reaffirmed their "ironclad" commitment to mutual defense. But there are lingering concerns over the scale and scope of US engagement.

Allies like Japan, South Korea, the Philippines and Australia have no choice but to try and meet the president’s conditions ...

Both the "deterrers" and "balancers" of Europe’s security debate have more to learn from each other than they think.

The American military has been the alliance’s bedrock. But shifting US priorities, including in the Middle East, are putting new pressure on European allies ...

CHARLES KUPCHAN is Professor of International Affairs at Georgetown University and a Senior Fellow at the Council on Foreign Relations. His most recent book is Isolationism: A History of America’s ...

Published on Monday, this policy document is the result of careful consideration of the initiatives to be launched around ...

After years pressing to end U.S. aid to Ukraine, many Republicans have abandoned that position now that President Trump is ...

Trump's unpredictability causes great anxiety in Europe, particularly his questioning of the mutual defense promise at the ...