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History's most enduring multination military alliance turned 70 Thursday, but it was a milestone more notable for festering disputes than celebrations of harmony.

Formed to protect a World War II-ravaged Europe in the throes of a Cold War with the Soviet Union, the North Atlantic Treaty Organization is now grappling with ongoing uncertainty about the United States' commitment to its leading membership in NATO, questions about burden-sharing fairness, and criticism of the growing ties of some members with longtime adversaries.

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The U.S. has suspended the delivery of parts and program materials to Turkey that it needs for standing up a key $12 billion jet fighter program there. The U.S. Defense Department says deliveries will not resume unless Ankara abandons its planned acquisition of a Russian missile defense system.

It's the latest slap in an escalating showdown between two longtime NATO allies whose ties have become increasingly strained in recent years.

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