The head of NATO says nothing can replace the US nuclear umbrella as the ultimate guarantee of our security,  and “Europe needs to know Uncle Sam still has our back”

But amid doubts about US commitment there is talk creating a comprehensive European nuclear capability without American-owned weapons.  Could the UK and France really provide a Europe only deterrent?  And if so, should they?

Sitrep compares our capabilities with the rest of the world and explains the complex thinking behind history’s bluntest and most powerful weapons.

Former NATO arms-control director William Alberque tells us why his thinking today is different, and Professor Michael Clarke explains why he has, very reluctantly, changed his view on Britain’s nuclear deterrent.