Reddit comments suggest it will lead to a decline in support for Ukraine against Russia, a cut to arms flows.

First the war was to be easily solved in a day, then a month, and now forgotten after three months. Trump treats it like a real estate deal that went bad, rather than a major upset of the international rule-based order that has held since the late 1940s. We don't want to go back to the old days when a large nation thought it could do whatever it wanted without consequences.