This started as a comment in response to @MichaelHarvey 's comment "British speakers might call the both the figurative and the literal thing an 'exit'." posted in response to Eli Harold's answer, but I think it merits an answer of its own:
The exit is the part of the highway that goes to the offramp. The off-ramp is the part from where you're completely off the highway to where you're on a normal street. Metaphorically, an "exit" would just be a course of action through which he is no longer invading Ukraine, and there's no need for the world to give him that; he can do it on his own. Literally, an off-ramp is a stretch of road that takes drivers not merely off the highway, but on to regular street. Looking at Lambie's picture, the right car on the right is right around the part where the exit turns into the off-ramp. I would say by the time you get to the things with orange and white diagonal stripes, you're off the freeway. But just having that wouldn't be very useful, would it? If you just had that, and nothing past it, that would take you off the freeway, but you'd be stranded with no way to get anywhere.
Metaphorically, the idea of an off-ramp is not merely to get out of the immediate situation, but to get into a situation that's acceptable. Just getting Putin to stop the invasion is not realistic; we need to find a way of him leaving Ukraine and saving face, and not feeling like he's put himself in an untenable situation.