Ukrainian President Volodymyr Zelensky has said Ukraine would be ready to hold talks with Russia in any format once a ceasefire is in place, but cautioned that it would be impossible to agree all the terms of a peace deal quickly.
The Ukrainian leader also told reporters at a briefing in Kyiv that a Ukrainian delegation meeting senior officials from western countries in London tomorrow would have a mandate to discuss a full or partial ceasefire.
"We are also ready to record that, after the ceasefire, we are ready to sit down in any format," the Ukrainian president told journalists at a briefing.
Mr Zelensky also said Ukraine was not discussing any new aid packages with the US.
"We have not yet had the opportunity to reach an agreement with the US on new aid or discuss the details," Mr Zelensky added.
His comments come as Russia struck the Ukrainian city of Zaporizhzhia with two guided aerial bombs, killing a woman and injuring 15 other people including two children.
Regional governor Ivan Fedorov said the attack damaged residential buildings and an infrastructure facility which he did not identify.
Local officials posted images of a multi-storey residential building with charred upper floors and rescuers helping the wounded.
Mr Fedorov said doctors were treating boys aged 14 and four as well as others injured in the attack, during which one of the guided bombs struck a densely populated area of the city at about 11.40am local time (9.40am Irish time).
The highly destructive guided bombs are difficult for Ukrainian air defences to intercept.
Zaporizhzhia, an important logistical and industrial hub in southeastern Ukraine that is about 50km from the front line, has been a frequent target of intensified Russian-guided bomb strikes.
Russia, which began its full-scale invasion of Ukraine in February 2022, partially occupies the Zaporizhzhia region, which is also home to Europe's largest nuclear power plant.
Russian forces also launched drone attacks on the city of Kherson in southern Ukraine and the city of Kharkiv in the northeast, regional officials said.
Four people were injured in Kherson, and a hospital was damaged in the drone attacks, said the regional governor, Oleksander Prokudin.
In Kharkiv, at least one person was hurt, mayor Ihor Terekhov said.
Local officials also said that Russian forces launched a mass overnight drone attack on Ukraine's Black Sea port city of Odesa, wounding three people and damaging many apartments.
"The enemy targeted a residential area in a densely populated district of Odesa," Mayor Hennadiy Trukhanov wrote on the Telegram messaging app, sharing pictures of a fire blazing and apartment buildings with windows smashed and facades damaged.
Governor Oleh Kiper said that three people were injured in the attack and were receiving medical help.
The Ukrainian air force said that Russia launched 54 drones in an attack overnight, of which 38 were shot down and 16 did not reach their targets, likely due to electronic warfare counter-measures.
Mr Kiper said the attack on Odesa damaged dwellings, civilian infrastructure, an educational institution and vehicles.
Videos shared by the emergency services showed crews putting out a large fire in one of the damaged buildings.
Odesa, with its three ports, has been a frequent target of Russian attacks in the more than three-year-old war with Russia.
US has not used up 'tools' to pressure Russia - EU's top diplomat
EU foreign policy chief Kaja Kallas has said the US has not used up its "tools" to pressure Russia, as she accused Moscow of playing for time with its Easter truce in Ukraine.
"They didn't keep to the truce. I mean, it's clear that Russia is playing all these games and stalling and does not really want peace," Ms Kallas said in an interview.
"They think that time is on their side, so they're not really showing any good signs, or any good will," she said.
US President Donald Trump threatened last week to walk away from efforts to halt the Ukraine war if there was not quick progress from Moscow and Kyiv.
Mr Trump later said he hoped for a Russia-Ukraine peace deal "this week", promising "big business with the United States" for both combatants if a ceasefire is signed.
Ms Kallas said Russia's announcement of a 30-hour truce over the weekend was a ploy aimed at stopping Mr Trump "losing patience" with the Kremlin.
The EU's top diplomat said that Kyiv and its European backers were hoping Washington would take a tougher line with Moscow before abandoning its peace push.
"They have tools in their hands to use, actually, to pressure Russia. They haven't used those tools," Ms Kallas said.
"If they are now walking away without using the tools that they have actually in their hands, then my big question mark is, why? Why aren't they using the tools to really end this war?"
Ms Kallas said that she feared Mr Trump might wash his hands of the war in Ukraine - but still look to pursue "deals and business as usual" with Moscow regardless.
Ms Kallas warned that it would be a mistake for the US to consider recognising the occupied Ukrainian region of Crimea as Russian territory as part of any deal.
"Then Russia clearly gets what they want," she said.
She said that the EU for its side would never recognise the peninsula - seized by Moscow in 2014 - as Russian.
"Crimea is Ukraine," Ms Kallas said.
"It means a lot for the ones who are occupied that others don't recognise this as Russian."
The EU has so far been excluded from the US-led peace efforts, but Washington concedes the bloc will have to be involved at some stage, given the vast sanctions it has imposed on Russia.
The Kremlin is desperate to get the economic punishment lifted as part of any negotiations.
But Ms Kallas warned that the EU should not ease any of its sanctions against Moscow before Russia has proved it is living up to any final peace deal.
"We need to see credible proof, also from Russian side, that they are keeping to this agreement before we make the steps," Ms Kallas said.
"I think we have to see this through, really."
EU assessing options to forbid new Russian gas contracts
Meanwhile, the European Commission is assessing whether it could legislate to forbid firms in the European Union from signing new contracts for Russian fossil fuels, a senior EU official has said.
It is also working on legal options to allow EU companies to break existing gas supply contracts with Russia without facing penalties, the senior official added.
With some member states vowing to block any EU sanctions on Russian gas, the Commission is instead looking at other tools that could hasten the end of Europe's reliance on Russian energy.
It plans to set out options for doing this in a "roadmap" due on 6 May.
The Commission is looking at options - potentially including EU trade measures - that could forbid European companies from entering into new contracts for Russian fuel, said the official, who was granted anonymity to discuss the confidential plans, which are still being developed.
That would aim to cut European companies' spot purchases of Russian liquefied natural gas (LNG).
While Russian pipeline gas deliveries have plunged since Moscow's invasion of Ukraine in 2022, the EU increased its imports of Russian LNG last year.
The EU still got 19% of its total gas and LNG supply from Russia in 2024.
