Why not? Why doesn't Putin use nuclear blackmail to bring Ukraine to heel? Morally the USA HAD to nuke Japen to save US GI lives, right? Same - Same?
You support Russia introducing nuclear war as the new normal for invading countries at peace, as a routine weapon for dictators attacking their neighbors?
Not even remotely the same. Also Ukraine is a hundred miles upwind. And the goal was to denazify and liberate the republicans that refused to go along with the coup. You don’t free them by nuking those areas.
That is a nato/neocon propaganda story. The threat was clearly aimed at other countries that decide to directly attack Russia or Russian forces.
In other words, if NATO directly intervenes.