With NATO holding its annual summit in Ankara this week, the alliance faces a bigger challenge than either Russia or China: its members no longer share a coherent understanding of the values, economic order, geopolitical vision and legal principles it was created to defend. Every enduring military alliance ultimately hinges on a deceptively simple question: What is it defending? Without a clear answer, it becomes reactive, defining itself by its adversaries rather than by a common purpose. When NATO was founded in 1949, that purpose was clear.

The upcoming NATO summit hosted by Ankara is not merely another routine meeting of a military alliance accustomed to reviewing its defense plans and

ANKARA, Turkey (AP) — Since he started work as NATO secretary-general almost two years ago, Mark Rutte has spent much of his time trying to keep the United States anchored

World Insights: NATO faces deepening fault lines ahead of Ankara summit-

As doubts swirl over US President Donald Trump's commitment to protecting NATO, Europe needs to take more responsibility for its own defence. After decades of underinvestment by…

Ahmet Davutoğlu argues that the alliance has lost its common purpose, defining itself solely by its adversaries.