Fighter jets are necessary to cover tanks in an assault. If the tanks are about to break through Russian lines, I'm sure Russia would commit every aircraft it has to stop the attack. The Battle of Kursk during World War II is known as one of the greatest tank battles in history, but it was also one of the greatest air battles.

Instead of a "fighter jet coalition", it would be better for Ukraine to have just one type of fighter. It would be simpler to train on and maintain. Since the US is reluctant to supply ATACMS, it should supply GLSDB.