If the US were working for Russia, what would they do differently other than supply weapons to Russia and/or join on their side? Each day it takes more and more faith to believe the opposite.
Freezing the conflict is NOT what Russia wants right now.
If one is extremely cynical, one could claim that the recent actions are a signal to Moscow to hurry up and finish the business in Donetsk/Zaphorizia so that a stable peace deal can be achieved instead of leaving things open yet again.
I'm not that cynical yet and think that Trump indeed attempts to extort a lend-and-lease deal of the same sort that the U.S. imposed on Britain in WW2.
In a political sense, well, that's much more debatable. The problem there is that because the US itself did not feel threatened, US aid came with a price tag: the impoverishment of Britain and the demolition of the trade barriers around the British Commonwealth. US aid was on a cash-only basis until Britain had spent all its hard-currency reserves (both gold and negotiable securities). Then came the Lend-Lease agreement -- arguably the point where the US truly entered the war -- and its price tag was explicit, although unadvertised: the agreement itself contains a clause stipulating the removal of the Commonwealth's trade barriers.