IMO Russia will take out the centre of Kiev in one hit
if the Ukraine uses long range missiles on Russia.
And of course the next logical move would be Tactical Nukes.
This is what war escalation means when a Nuke Power's
sovereignty is threatened. Period......otherwise. why have Nukes?
PS: The US knows that & that's why the US/UK meeting last week
did not give the nod to the UK long range missiles
