President Trump jabs at the Russian leader with threats; Vladimir Putin responds with flattery. But there are notable signals in their jousting, including a revived discussion about nuclear arms ...

President-elect Donald J. Trump has made big promises on Ukraine, Iran, China and crises around the globe. But he will have ...

First it was France’s president, Emmanuel Macron, who angered his NATO allies by suggesting that soon the West could be forced to send troops to Ukraine, portending a direct confrontation with Russian ...

David E. Sanger is a national security correspondent and senior writer for the New York Times, a contributor to CNN and an adjunct lecturer at the Kennedy School of Government. In a 38-year ...