Under the rules of war, Russia has a right to strike targets where weapons are being manufactured for use against them, and where recruits are trained for use against them. There are also facilities that are operated by Western military personel, in Poland and in Western Ukraine, which relay satellite reconaissance information to the Ukrainians so they can make strikes with drones and Western missiles. Those facilities and satellites are also legitimate targets.

These are the same justifications that the US was using for drone striking Pakistan, Iran and other neighbouring countries while occupying Iraq and Afghanistan.

The fact that the Russians have been so patient and reluctant to strike at these targets shows how serious they take the danger of nuclear war. But the West keeps doing what it's doing because they like to pretend that this way, they don't seem to be at war with Russia, and they don't stop, because they think Russia is bluffing when.