Ushakov’s comments follow Russian President Vladimir Putin's May 11 invitation for direct talks with Ukraine in Istanbul starting May 15.
The assault began around 2 a.m. on May 11, with Russian forces deploying 108 Shahed-type attack drones and decoy UAVs from multiple directions, Ukraine’s Air Force said.
Zelensky called a ceasefire the essential first step toward ending the war.
The number includes 1,310 casualties that Russian forces suffered over the past day.
"Think of the hundreds of thousands of lives that will be saved as this never ending 'bloodbath' hopefully comes to an end... I will continue to work with both sides to make sure that it happens."
"An unconditional ceasefire is not preceded by negotiations," French President Emmanuel Macron told reporters on May 11.
U.S. State Department Spokesperson Tammy Bruce called for "concrete proposals from both sides" in order for Washington to "move forward" in peace negotiations.
"If they speak to each other in Russian, he doesn't know what they are saying," one Western official told NBC News. Michael McFaul, former U.S. ambassador to Russia, called Witkoff's approach "a very bad idea."
Tougher sanctions "should be applied to (Russia's) banking and energy sectors, targeting fossil fuels, oil, and the shadow fleet," the leaders of Ukraine, the U.K., France, Germany, and Poland said in a joint statement.
"Russia is ready for negotiations without any preconditions," Putin claimed in an address marking the end of the three-day Victory Day ceasefire. He invited Ukraine to begin talks in Istanbul on May 15.
The American-made weapons cannot be exported, even by a country that owns them, without approval from the U.S. government.
While serving as a bishop in Peru, Robert Prevost, now Pope Leo XIV, called the full-scale war "a true invasion, imperialist in nature, where Russia seeks to conquer territory for reasons of power."
Speaking to CNN on May 10, Peskov commented on the latest ceasefire proposal from Ukraine and Europe, responding that Russia needs to "think about" it, but is "resistant" to pressure.
Speaking at a press conference in Kyiv on May 10, President Volodymyr Zelensky rebuked the idea of a demilitarized zone in the war and emphasized the importance of first securing a ceasefire.
Zelensky: 'We won't delay counteroffensive' despite lack of F-16 jets

Ukraine will launch its counteroffensive before its allies hand the country the U.S.-made planes, President Volodymyr Zelensky told Scandinavian media in an interview published on April 29.
"It would help a lot... But we understand that we will not delay this, and we will start even before we have F-16s or something else," he said.
Providing Ukraine with F-16 fighter jets will deter Russia rather than provoke it, Foreign Affairs Minister Dmytro Kuleba wrote on April 27.
"F-16s will not (escalate the war) either. Giving Ukraine, F-16s will deter Russia rather than 'provoke' it. Time to take this step," Kuleba added.
Ukraine has been requesting fighters for months to defend its skies and maximize the effectiveness of its combined arms forces during a future counteroffensive.
Of all the available models, Ukraine has shown the most interest in the U.S.-built F-16, in service since the 1970s, and is operated by over 20 nations.
However, multiple Western allies, including the U.S. and Germany, have ruled out sending fighter jets soon, while debates about their provision are ongoing.
Ukraine’s lack of advanced aircraft and missiles will likely prolong Russia’s war of aggression and result in thousands of deaths, while the country suffered a mass missile strike on April 28.
The April 28 strike was Russia's first mass attack in nearly two months. It targeted several regions far from the battlefield. In Dnipro, the strikes killed a two-year-old and her mother.

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