The AGM-129 is so stealthy they lost track of a few of them back in 2007.

It’s not really a fully stealth cruise missile anyway. It has stealth technology and crawls at a speed of 500 mph. Range is 2000 miles. So yes, technically you could launch one from a 60 year old B-52 to vaporize Russian civilians.

For what I don’t know. Last time the Russians made a move, in Georgia, the West did not respond.

700 warheads is more than sufficient. The START treaty also allows for modernization.