Ukraine's President Volodymyr Zelenskyy shakes hands with US President Donald Trump's envoys Jared Kushner and Steve Witkoff in Kyiv. Explosions have been heard in Ukraine’s capital, Kyiv, as Russia resumed attacks following a three-day halt during a visit by US envoys seeking to revive efforts to end the war. Kyiv officials said ballistic missiles had been fired towards the city and reported damage to residential buildings in two districts. “Please remain in shelters until the air raid alert is lifted,” officials said on Telegram. US special envoy Steve Witkoff and Jared Kushner, the son-in-law of US President Donald Trump, met Ukrainian officials in Kyiv on Sunday, a day after holding intensive talks with Russian President Vladimir Putin in Moscow. The meetings formed part of Washington’s renewed diplomatic push to bring Russia and Ukraine closer to a peace agreement. Witkoff said Russia and Ukraine had agreed to a three-day ceasefire ahead of the visit. “At President Trump’s direction, United States negotiators visited both Moscow and Kyiv in order to facilitate additional dialogue to end the Russia-Ukraine War,” he said. He said the delegations had met both Putin and Ukrainian President Volodymyr Zelenskyy to discuss each side’s proposals. In Kyiv, he added, the talks also included national security advisers from the UK, Germany and France. The latest Russian attacks came a day after Ukrainian forces struck three Russian oil refineries. President Zelenskyy said on Monday that Ukrainian drones had targeted oil-processing facilities in Russia’s Perm region, Tatarstan and Ryazan. The Perm region is home to a refinery owned by Russian private energy company Lukoil. Zelenskyy also said Ukrainian forces had targeted Russian drone launch sites in the Kursk region and “a target” in the Black Sea, without providing further details. He posted a video on Telegram showing smoke rising from the sites following the attacks. The Ukrainian strikes came after Zelenskyy met Witkoff and Kushner in Kyiv on Sunday. Witkoff said on Monday that “substantive progress was made” during the discussions, including movement towards scheduling further trilateral negotiations. “President Trump is working hard to stop the killing and work towards a lasting and durable peace,” he said in a post on X. The US envoys travelled to Kyiv by train after Russian strikes affected airports in the capital.