So it's quite ok for Putin to send weapons to attack and kill on Ukrainian territory and launch attacks on them from the safety of Russian territory but not ok for Ukraine to take steps to blunt those attacks. What a ridiculous proposition....how many Wars can you recall where the aggressor and invader has free reign to attack its neighbour from the "safety" of its own borders and have some kind insulation from attacks in response. Wars have a bad habit of getting out of control and if this one does there's only one Despot to blame.
