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That would be a good start. Zelensky can also announce that if anymore missile strikes occur within Ukraine against non military targets or in Kiev then he will reciprocate by bombing inside Russia and perhaps Moscow. Put the ball squarely in Poostain's court on the world stage of public opinion.The only escalation that I see now is for Biden to send longer distance missiles.
Longer range missiles can be used to hit Russian GLOCs deeper in to the Donbas and Crimea leaving their untrained forces with even less support and enabling Ukrainian forces to drive deeper and faster.
I wouldn't mind seeing NATO protect Ukraine's northern border but that's not likely to happen. I know Russia is sending troops to Belarus which is likely a subterfuge. Imagine if Russia tried an attack from the north again and got humiliated a second time. And I really don't think they have the equipment to support any kind of an offensive from the north. It's just designed to tie up some of Ukraine's assets.
What is really needed is for India and China to make strong statements against Russia.