How would the global risk calculus of individuals, organizations, and governments shift if a weapon of mass destruction were detonated in a heavily populated city?Would such an event promote closer cooperation between countries in fighting the spread of WMDs or would it drive countries further apart and back within their sovereign borders?

closer cooperation

Explanation:

The weapon of mass destruction is generally associated with the nuclear weapons and they are apart of the biological weapons of combat and were sued against the japan and the Nagasaki bombings. The weapons of mass destruction include the air, water, and the land destruction means and in cases of such an event the two countries to likely to brings together for the fight against the weapon of mass destruction.