It's more like telling Putin to go all in on Ukraine as that country is now 100% controlling transit of Russian gas to EU, so any Russian export is at the mercy of the US in the end. The alternative to bypass Ukraine is now gone, making the goal of controlling the Ukrainian territory a strategic necessity. We can expect the war to get much worse soon. Pretty much Iraq situation on Russian side. This might also lead to their submarines cutting cables and pipes elsewhere in the world, damaging the infrastructure to keep the other side busy.