Sharjah24 – Reuters: Ukraine's President Volodymyr Zelenskiy on Sunday warned of more potential Russian attacks on his country's energy infrastructure, as officials urged residents in the capital Kyiv to consider making plans to leave as ongoing strikes threaten the power supply.

Zelenskiy, in his regular nightly address, said Russia was "concentrating forces and means for a possible repetition of mass attacks on our infrastructure. First of all, energy."

More than 4.5 million consumers were already without power, Zelenskiy said, amid concerns support for Ukraine's cause could waver as the war's impacts of energy and food prices persist into winter.

U.S. National Security Advisor Jake Sullivan, who travelled to Kyiv on Friday and pledged Washington's "unwavering and unflinching" support for Ukraine, has held undisclosed talks with Russian officials designed to avoid further escalation, the Wall Street Journal reported on Sunday.

News of those contacts emerged after a report said Washington was urging Kyiv to signal an openness to talks with Russia.

Presidential adviser Mykhailo Podolyak said earlier on Twitter that Ukraine would "stand" despite Russian attacks on its energy infrastructure, adding that this would be done by using air defence, protecting infrastructure and optimising consumption.

The country faced a 32 percent deficit in projected power supply Monday, Sergei Kovalenko, CEO of YASNO, a major supplier of energy to the capital, said on his Facebook page.

The warnings followed remarks by Kyiv Mayor Vitali Klitschko urging residents to "consider everything" including a worst-case scenario where the capital loses power and water.

Residents should consider staying with friends or family outside the city, he said in a television interview.