Kremlin spokesperson Dmitry Peskov warned Wednesday that "a whole series of nuances" needs to be addressed before Russia will agree to any U.S.-brokered peace deal.

Clinching a deal to end the Russia-Ukraine war “is far too complex to be done quickly,” a senior Kremlin official said Wednesday, as the U.S. labors to bring momentum to peace efforts and expresses frustration over the slow progress.

For the first time, Ukrainian negotiators are cautiously optimistic. “We are trying to improve our position,” says a senior Ukrainian official. “But there is bluffing on all sides. And the danger is someone overplays their hand.