Ukraine seeks ironclad guarantees against future Russian aggression. These can come in two general forms: outside assurances, with the most conspicuous one being the Article V protections that come ...

The Financial Times reported that Trump had encouraged Kiev to punish Putin by striking deep inside Russian territory—perhaps even hitting Moscow—if the U.S. provided it with more long-range weapons.

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Senate Majority Leader John Thune says Republicans will vote on a Russia sanctions bill once Trump approves it, as pressure ...

Poland is leading European efforts to use frozen Russian assets to fund Trump's $10 billion weapons package for Ukraine rather than burden European taxpayers with the costs.

President Donald Trump has long worked to bring peace to Ukraine, but his recent major policy adjustments in response to ...

Trump issued a theatrical ultimatum to the Kremlin. The world shuddered, expecting the consequences. Belligerent Europe was disappointed. Russia didn’t care,” one of Putin’s top ...

As Russia's influence wanes in the South Caucasus due to its war in Ukraine, Armenia and Azerbaijan are strengthening bilateral ties and seeking new partnerships with Turkey, the European Union, and ...

MICHAEL KIMMAGE is Professor of History at the Catholic University of America. He is the author of Collisions: The Origins of the War in Ukraine and the New Global Instability.

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

An internal admission from Chinese Foreign Minister Wang Yi reveals Beijing's concern over Russia's defeat in Ukraine, ...

President Donald Trump is making a surprising pivot on the war in Ukraine, shifting positions on weapon sales and sanctions in a way that makes him look more like his predecessor Joe Biden and less ...