"We agreed that a full and unconditional ceasefire must begin on Monday, May 12, for at least 30 days. We jointly demand this from Russia, and we know we are supported in this by the United States," Zelensky said.
The announcement follows mounting fears that the two nuclear-armed countries were on the brink of engaging in another full-scale war.
Ukrainian media outlet ZN.UA reported on May 10 that their law enforcement sources confirmed an ongoing probe by the National Anti-Corruption Bureau into suspected embezzlement, money laundering and bribery.
Iran is preparing to send Russia Fath-360 short-range ballistic missile launchers, Reuters reported on May 9, citing Western security and regional officials familiar with the matter.
"Ukraine and all allies are ready for a complete unconditional ceasefire on land, in the air, and at sea for at least 30 days, starting as early as Monday," Ukraine's Foreign Minister Andrii Sybiha wrote.
U.S. President Donald Trump has acknowledged in private that Russia is difficult to negotiate with because they "want the whole thing," referring to Ukraine, the WSJ reported, citing sources familiar with the comments.
The visit marks Merz’s first trip to Ukraine, and the first time all four leaders have travelled there together.
A notice about the airspace closure was published on the U.S. Defense Department's NOTAM (Notice to Airmen) website on May 10, as cited by Ukrainian defense news outlet Militarnyi.
"As in the past, it is now for Russia to show its willingness to achieve peace," the EU's statement reads.
Kremlin spokesperson Dmitry Peskov rejected the idea of a 30-day ceasefire between Russia and Ukraine, claiming in an interview with ABC News on May 10 that it would be "an advantage" for Ukraine.
"Our involvement in the war was justifiable, and this belongs to our sovereign rights," North Korean dictator Kim Jong Un said. "I regard this as part of the sacred mission we must execute for our brothers and comrades-in-arms."
The number includes 1,310 casualties that Russian forces suffered over the past day.
Russia doesn't have as many advantages as it seems, US defense secretary says

Russia does not hold all the advantages in the full-scale war against Ukraine, outgoing U.S. Defense Secretary Lloyd Austin said in an interview with Bloomberg News on Jan. 8.
Austin's comments come on the eve of the Ukraine Defense Contact Group (UDCG) meeting at the U.S. Ramstein Air Base in Germany. The Jan. 9 meeting will be the last Ramstein summit before U.S. President-elect Donald Trump takes office.
"There's a thought that Russia has the ultimate hand here and it has every advantage," Austin told Bloomberg News.
"It has some advantages, but it doesn't completely dominate this equation here. And if it gets what it wants, it will cost them in the future."
Austin said that Ukraine's strengths and Russia's challenges should affect potential peace negotiations, which Trump has promised to initiate after his inauguration. The push for a quick end to the war has led to fears that Kyiv will be pressured into unfavorable concessions, including loss of land.
Russia currently occupies around 20% of Ukrainian territory. President Volodymyr Zelensky has acknowledged that Ukraine's military cannot currently retake all of it by force and has said that some regions, including Crimea, will have to be liberated through diplomatic means.
Even if Russia gains territory in a negotiated agreement, Austin said, continuing to occupy Ukrainian regions will drain Moscow's resources.
"Russia will have to invest a lot of land forces to hold it," he said.
Austin also noted Russia's dependence on Iran and North Korea for assistance, including "weapons and munitions and also now people." Up to 12,000 North Korean soldiers have been dispatched to Russia's Kursk Oblast, to fight alongside Russian troops against Ukrainian forces.
The outgoing U.S. administration has said that it aims to bolster Ukraine's position in upcoming negotiations with an influx of military aid and efforts to shore up its international alliances. The UDCG summit on Jan. 9 will focus on supporting Ukraine's defense capabilities through the year 2027, according to the Pentagon.
The UDCG consists of over 50 countries, including all 32 NATO members, that convenes at the Ramstein Air Base on a regular basis to coordinate military support for Ukraine. Trump has not yet outlined his plans for the contact group, and some believe the next meeting may be its last.
Ahead of his final Ramstein summit, Austin defended U.S. President Joe Biden's strategy on Ukraine.
"What it did was it helped Ukraine survive, it helped Ukraine defend its sovereign territory," Austin said.
"The loss of 700,000 troops killed and wounded — that would've been beyond imagination three years ago," he said, referring to the heavy losses Russia has sustained over the course of the full-scale war.

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