Donald Trump’s suggested the US could restart explosive tests of nuclear weapons, after more than 30 years. Is this a symptom of a nuclear arms race already underway, or could it kickstart one?

William Alberque, who has played a leading role in NATO’s nuclear policies, and Jon Wolfsthal who advised President Obama, share their thoughts on whether the US is about to break a global ban on detonations, and what that could mean for us all.

Sitrep also explains how atomic weapons have been tested and verified, without explosions, since the 1990s.

And as the UK develops a new nuclear warhead in parallel with the US, Professor Michael Clarke assesses whether any testing row could drag Britain in by association.