Ukraine should contemplate not just defending itself, but attacking Russia and Russians in their home cities in the event of a Russian invasion.
They could use “Cherry Noble” as a “Deadman’s Invasion Switch” and threaten to release A GIANT cloud of raduioactive debris should Russia invade them.....
Ukraine has little or no capability to do that. The pro-Russian government of the last decade did not just loot the country, but they decimated the armed forces too. They literally gave their nukes and bombers to Russia too.
The last time two nuclear powers (India and Pakistan) had a war it almost killed us all and they only had atomic weapons. The Ukraine and Russia both also have thermonuclear warheads (aka “H-Bombs”).