“Read My Lips: No Throttle or No You?” Without you. Without light or without you? Without you. Without water or without you? Without you. No food or no you? Without you,” Mr. Zelensky said, underscoring his country’s willingness to shoulder the burden of expelling Russian forces. Ukraine’s nuclear operator said the last reactor at the Russian-held Zaporizhzhia nuclear power plant was shut down on Sunday. Rafael Grocia, head of the International Atomic Energy Agency, said on Monday that both sides had shown “signs of interest” in agreeing a demilitarized zone around the plant. The speed of the Russian collapse has prompted shocking and sometimes angry exchanges among Russian commentators trying to explain the disaster. Vitaly Gadchev, a Russian-appointed official in the Kharkiv region, said Ukrainians outnumbered Russians eight to one during the attack. Boris Nadezhdin, a former lawmaker, speaking on an NTV television talk show, blamed “people who convinced President Putin that the operation will be quick and effective” and said it was time to look at peace talks. “These people really set us all up,” he said. “We are now at the point where we have to understand that it is absolutely impossible to defeat Ukraine using these resources and methods of colonial warfare.”