Lol. With what manpower are these Russians going to built new cities? Vast majority of Russian population lives near Europe it won't take a lot of nukes to take them out and leave a residue.Just imagine, nato can drop 30 bombs on russia they can still find some place in their vast country to rebuild new cities.
UK or England on the other hand is just an island , 3 or 4 bombs and the whole country will be a grand toast. All that british can do is jump into that freezing ocean or run away to US if they survive.