Air Marshal Sir Christopher Harper, RAF Ret., former director-general of NATO’s International Military Staff, says NATO’s invocation of the Article 5 commitment shouldn’t depend on a threatened nation’s defense-spending level and discusses how Baltic air defenses can be improved on both a local and alliance level to deter Russia, what went right and wrong at the 2018 NATO Summit in Brussels, and much more in a wide-ranging, July 14, 2018, interview with Defense & Aerospace Report Editor Vago Muradian at the Royal International Air Tattoo at RAF Fairford in the United Kingdom. Our RIAT coverage is sponsored by Leonardo DRS.