caption: NATO Secretary General <PERSON>, left, and British Prime Minister <PERSON>, right, welcome Portuguese Prime Minister <PERSON> at the official arrivals for a NATO leaders meeting at The Grove hotel and resort in Watford, Hertfordshire, England, Wednesday, Dec. 4, 2019. NATO Secretary-General <PERSON> rejected Wednesday French criticism that the military alliance is suffering from brain death, and insisted that the organization is adapting to modern challenges. (AP Photo/ <PERSON>)