Russia Pledges to Withdraw from Kherson. To Nuke it?

As above. If I was a citizen in Kherson I would leave the city. There has been talk of Nukes on both sides and some sort of nuclear event in Kherson would deny it to Ukraine.

Alongside that Russia could blame the West, probably saying the West had supplied nukes to Ukraine in defiance of previous agreements.

This can't be a simple withdrawal by Russian forces.