Ukraine did not receive a warning from the US about an impending Russian missile attack on Sunday evening, Volodymyr Zelenskyy has said, reviving concerns that Washington is withholding intelligence in order to bully Kyiv into capitulating to Moscow.

Yuri Ihnat, a spokesperson for the Ukrainian Air Force, said on television on Monday morning that Ukraine had not received a warning before a Russian missile barrage hit power plants in Kyiv at around 11pm. Earlier, a Ukrainian government official had told the Guardian the US had not warned the capital about the impending missile strike.

Ukraine did receive a warning before a successive strike, at 3am, Ihnat added.

“Once again, Russia launched a ballistic missile attack in multiple waves throughout the night, and once again, there was no warning from our partners,” Zelenskyy wrote in a social media post on Monday morning.

“When the supply of missiles for Ukrainian air defence is blocked, and Russia receives sanctions relief or delays, it is, unfortunately, a denial of reality on the part of our partners,” the president added.

On Friday Donald Trump waived a sweeping package of sanctions on Russia, telling Congress the pause on the legislation, named for the late senator Lindsey Graham and passed by both chambers, was in the national interest. Ukraine has also complained of slowed deliveries of PAC-3 air defence missiles from the US.

The US president wrote on Truth Social on Sunday: “My decision on Russia is a very simple one. I am in the process of negotiating peace in the war between Russia and Ukraine, and don’t want to do anything that will drive, foolishly, Russia away from the bargaining table.

“Zelenskyy doesn’t care, and frankly, with all of the money that Europe is famously giving him … he doesn’t want to end this war, and probably never did.”

For years, the US had warned Ukraine before Russia launches ballistic missiles, giving authorities several minutes to sound alarms and allow civilians to reach shelters before the strikes hit. However, Ukraine has said it was not warned on at least three days in the past week before missiles were launched, amid a public quarrel between Zelenskyy and Trump.

Speaking in the early hours of Monday on a trip to Samarkand, Uzbekistan, the US secretary of state, Marco Rubio, said: “If it happened last night, I don’t know exactly. I know a few nights ago there was a software problem involving their early warning system.”

US officials have not previously mentioned a software glitch in the early warning system. In at least one case, Ukrainian officials had been told that bad weather over southern Russia had obscured preparations for the missile launch. Rubio said the military’s European Command was looking into the strikes.

The US has maintained plausible deniability as services and programmes provided to support Ukraine have suddenly begun to fail. The Trump administration has denied that it throttled services in Ukraine for Starlink, the satellite internet service run by Elon Musk that is used both on offensive drones and anti-air weapons by Ukraine.

Ukraine has also said US weapons delivered through the PURL scheme, where Europe purchases US weapons then delivers them to Ukraine, have been delayed. The Trump administration reportedly threatened Kyiv with a slowdown in crucial weapons deliveries unless it stopped striking Russian oil refineries.