tonight with the context, brian taylor, political commentatorfor the herald, and leigh ann caldwell, political reporter for the washington post. welcome to the programme. there s been an evolution in the way the west views this war in ukraine, an evolution in the arms which nato countries are supplying first it was shoulder held stingers, then the hymars, next came the patriot missile systems, now it s a conversation over tanks. the red lines have shifted with the evolving nature of the war. in recent months, the allies have come to the opinion that a year long stalemate in ukraine is in no one s favour except russia s. so what would it take to allow ukraine to win rather than just avoid losing? what would ukraine require in order to punch through the russian defences in towns like bakhmut and soledar, from where the bbc s andrew harding reports. we are in an area where russian and ukrainian infantry now appear to be fighting at close quarters. clambering through the remain