What is Michael McFaul's analysis of the current U.S.-Russia negotiations regarding Ukraine?

Former Ambassador McFaul observes that Russia is not prepared to offer any concessions in negotiations, instead maintaining maximum positions while waiting for the U.S. and Ukraine to make further compromises. He notes there's "absolutely no evidence" that Putin is willing to concede anything, while reports suggest the Western side might lift sanctions. McFaul advises that U.S. strategy should not respond to Russia's maximum positions. Instead, negotiations must clarify what Russia needs to concede to begin meaningful peace talks. He warns that if only Ukraine or Western concessions are on the table without reciprocal Russian concessions, the negotiations will inevitably fail.