Ukraine awaited signs Friday that Russia is abiding by a commitment that President Donald Trump said it made to temporarily halt attacks on Ukraine’s power grid, as Kyiv and other regions are gripped by the bitterest winter weather for years.

Trump said late Thursday that Russian President Vladimir Putin had agreed not to target the Ukrainian capital and other towns for one week, as the region experiences frigid temperatures that have brought hardship to civilians.

Trump didn't say when the call with Putin took place or when the moratorium would go into effect, and the White House didn't immediately respond to a query seeking clarity about the scope and timing of any limited pause. There was no immediate confirmation from the Kremlin that Putin has committed to the move.

Ukrainian President Volodymyr Zelenskyy was skeptical about Putin’s readiness for such a step as Russia’s all-out invasion, which began on Feb. 24, 2022, approaches its four-year anniversary next month with no signs that Moscow is willing to reach a peace settlement despite a U.S.-led push to end the fighting.

“I do not believe that Russia wants to end the war. There is a great deal of evidence to the contrary,” Zelenskyy said Thursday in comments made public on Friday.

He said that Ukraine is ready to halt its attacks on Russia’s energy infrastructure, including oil refineries, if Moscow also stops its bombardment of the Ukrainian power grid and other energy assets.

Kyiv, which recently has endured severe power shortages, is forecast to enter a brutally cold stretch starting Friday that is expected to last into next week. Temperatures in some areas will drop to minus 30 degrees Celsius (minus 22 Fahrenheit), the State Emergency Service said.

Russia has sought to deny Ukrainian civilians heat, light and running water over the course of the war, in a strategy that Ukrainian officials describe as “weaponizing winter.”

The possibility of a respite in energy sector attacks was discussed at last weekend’s meeting in Abu Dhabi, the capital of the United Arab Emirates, between envoys of Ukraine, Russia and the United States, Zelenskyy said.

Zelenskyy said that he had agreed to adhere to a “reciprocal approach” on energy assaults.

“If Russia does not strike us, we will … take corresponding steps,” he told reporters.

However, it was unclear whether and how any partial truce might work amid ongoing wider fighting and mistrust between the two countries.

“There is no ceasefire. There is no official agreement on a ceasefire, as is typically reached during negotiations,” Zelenskyy said. “There has been no direct dialogue and no direct agreements on this matter between us and Russia.”

Ukraine had originally posited the idea for an energy ceasefire at talks in Saudi Arabia last year, Zelenskyy said, but the proposal gained no traction.