Voldemort Vs NATO

Idea drawn from Shock and Awe by Srelex. Voldemort has won. Harry Potter is gone, and the Order of the Phoenix is defeated. And, last of all, Voldemort has taken over Muggle Britain, and Muggles are now slaves to him. In the midst of this, the Prime Minister escapes and puts out a call for help. A call that NATO will answer. How will Voldemort fare in a war with NATO?