NATO, the most successful alliance in history, is beset by unresolved tensions and divergent interests that are undermining its cohesion, credibility and capability. In this new book, Mark Webber, James Sperling and Martin Smith explore four key post-Cold War developments that threaten NATO's survival: an overextended geostrategic reach and an unwieldly security policy portfolio; a failure to address capability short-falls and meet defence spending benchmarks; US weariness and European...