Russia's move now
My guess they will come back with a demand like withdrawal of Ukranian troops from the four oblasts they've claimed before they even agree to the 30-day ceasefire. And probably for Zelensky to resign, a major optics win for them.
Then we'll have to see how far the Trump admin is willing to bend over.
There have been some "sticks" against Russia, but very weak ones. They don't care about further sanctions at this point.
Short of entering the conflict directly, which would never happen, the only other card we would have would be to increase aid. But given the rhetoric coming from the Trump admin, how likely is that.