The Laser intended for Polyurea was tested on the Beriev A-60, so the equipment required already existed. I think the main issue is whether Moscow can actually get something into orbit before the USSR ceases to exist.I can just see a situation where the Americans manage to get an actual laser cannon into space, and then it's the awkward 'oh shit we need a working one now' moment from Moscow.
A lesson here about Fifth Dimensional Chess Playing.
There was a lot of paranoia and skewed deductions by the Soviets during the Cold War. For example, they build Buran, not because they needed it or even because the Americans had a Shuttle, but because they couldn't believe NASA economic case for it - 700 flights each with 30 mt of payload, planned between 1978 and 1990. Which mean no less than 21 000 mt into orbit - enough for 175 Apollos (*120 mt) or 14 Mars shots (*1500 mt each).A lesson here about Fifth Dimensional Chess Playing.