BRUSSELS—NATO, fresh from a bruising fight over Sweden’s accession, turns 75 on Thursday amid a new spat over who should next lead the military alliance.

       The dispute casts a shadow over what was meant as a celebratory gathering of the top diplomats from the North Atlantic Treaty Organization’s 32 members this week. It pits early members against ones that joined after the Cold War, widening a rift that emerged with Russia’s invasion of Ukraine.

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