blimey
Have you any more info on what Sir Michael is on about/source for his concerns?
As I understood it of all the Presidential candidiates Macron and Hamon were the only two firmly of view that France should remain in NATO ( though if I read things correctly Macron is not in favour of further NATO expansion).
La place de la France dans l'OTAN - propositions des candidats à l'élection présidentielle 2017