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.
Russian attacks against Ukraine kill 4, injure 33 over past day

Russian attacks across Ukraine killed at least four people and injured at least 33 over the past day, including children, regional authorities reported on Oct. 7.
Ukrainian air defenses shot down two Kinzhal missiles launched against Kyiv Oblast and 32 attack drones across various regions, the Air Force said.
Russia reportedly attacked Ukraine with 80 projectiles, including an Iskander-M ballistic missile, a guided Kh-59 missile, and one more missile of an unknown type.
Russia launched the Kinzhal missile strike against Kyiv on the morning of Oct. 7, the city's authorities reported. All the missiles were intercepted, with debris falling in three districts, starting a fire, and damaging the roof of a multi-story building and of a supermarket.
No casualties were reported.
A third Kinzhal missile hit the area of the Starokostiantyniv airbase in Khmelnytskyi Oblast, the Air Force said. No casualties or damage to civilian infrastructure were reported. Ukraine does not usually comment on possible damage to military facilities.
Four people were injured during Russian attacks against Dnipropetrovsk Oblast, Governor Serhii Lysak said.
Three residents were wounded during a Russian rocket strike against the Synelnykove district, which also damaged houses, a car, a garage of an agricultural company, and other property.
A 45-year-old man was hospitalized with blast injuries as a result of a drone impact in the field during harvest.
Russian attacks against Donetsk Oblast killed three people and injured 12 over the past day, Governor Vadym Filashkin reported.
One civilian was killed and two injured during an airstrike against the town of Kostiantynivka that damaged two high-rise buildings, a shop, a coffee shop, a bank, a post office, and an administrative building.

One person was killed and one injured in the town of Chasiv Yar, and the same casualty figures were reported in the village of Illinka.
Three injuries were reported in Bilenke, and one each in Toretsk, Serebrianka, Shevchenko, Izmailivka, and Shakhtarske.
In Kharkiv Oblast, one person was killed and seven injured over the past day, according to Governor Oleh Syniehubov.
The fatality – a 57-year-old man – was reported following a drone attack against the village of Pershotravneve.
Three men aged 40, 54, and 68 were injured in a drone strike against the town of Kupiansk on Oct. 6, and a 50-year-old man, a 51-year-old woman, and a 16-year-old boy were injured during an attack against the village of Cherkaska Lozova.
A 73-year-old woman was wounded during a strike against the village of Mytrofanivka at 3 a.m. on Oct. 7.
Five civilians were injured during Russian attacks against Kherson Oblast, according to the regional governor, Oleksandr Prokudin. A critical infrastructure facility, a high-rise building, 25 houses, and other property were damaged.
Four people, including a child, were injured during a Russian drone attack against the Sumy community in Sumy Oblast, the regional authorities said.
In Zaporizhzhia Oblast, a 61-year-old woman was injured during an attack against the Polohy district, according to the authorities.
Chernihiv, Luhansk, Mykolaiv, and Poltava oblasts were also attacked, but no casualties were reported.
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