Ukraine hit Saint Petersburg with a large-scale drone attack, causing fires at an oil refinery and depot, Moscow said Sunday, as Kyiv accused Russia of violating Donald Trump's "energy ceasefire" dozens of times and leaving tens of thousands without power.

Trump last week announced an "energy ceasefire" -- which neither side said they agreed to beforehand -- that quickly collapsed, with Moscow continuing strikes on Ukraine's power grid and Kyiv eventually resuming hits on Russian oil refineries. Trump has been angered by Kyiv's strikes on Russian refineries -- which he says are contributing to a surge in global fuel prices.

On Sunday, Ukraine hit Russia's second city as its ties with Washington strained in recent days. Kyiv says its retaliatory strikes are fair retribution for years of Russia's offensive and destruction of its energy infrastructure.

Ukraine's Volodymyr Zelensky accused Russia Sunday of hitting Kyiv's energy, oil and gas facilities 76 times since ceasefire.