Polish and allied aircraft were deployed early this morning to ensure the safety of Polish airspace after Russia launched airstrikes targeting western Ukraine near the border with Poland, the armed forces of the NATO-member country said.
"Fighter jets were scrambled, and ground-based air-defence and radar reconnaissance systems were put on heightened readiness," the operational command of the armed forces said in a post on social media.
"These measures are preventive in nature and are aimed at securing and protecting the airspace, especially in areas adjacent to the threatened regions."
Ukrainian military said Russia had launched an early morning air attack on Kyiv just days after a US-led round of peace talks in Miami ended.
"Air defence forces are working to eliminate the threat in the sky over the capital," the Kyiv military administration said on Telegram, urging residents to remain in shelters until the all-clear is given.
Officials did not immediately report casualties or damage. The full-scale of the attack was not immediately known.
The weekend talks in Miami brought together US officials with Ukrainian and European delegations, alongside separate contacts with Russian representatives, as Washington tested whether there was scope for a settlement to end Russia's war in Ukraine.
Ukrainian President Volodymyr Zelensky has said initial drafts of US proposals for a peace deal between Ukraine and Russia meet many of Kyiv's demands,
But he suggested that neither side in the almost four-year war is likely to get everything it wants in talks on reaching a settlement.
"Overall, it looks quite solid at this stage," the Ukrainian leader said of recent talks with US officials who are trying to steer the neighbouring countries toward compromises.
"There are some things we are probably not ready for, and I’m sure there are things the Russians are not ready for either," Mr Zelensky told reporters in Kyiv.
US President Donald Trump has for months been pushing for a peace agreement.
However, the negotiations have run into sharply conflicting demands from Moscow and Kyiv.
But US envoy Steve Witkoff said on Sunday he held "productive and constructive" talks in Florida with Ukrainian and European representatives.
"We are talking. It’s going OK," Mr Trump said while on holiday at his Mar-a-Lago estate in Florida.
Asked if he planned to speak to Mr Zelensky or Russian President Vladimir Putin, Mr Trump did not say, offering only of the fighting, "I’d like to see it stopped".
Mr Zelensky said that "nearly 90%" of Ukraine’s demands have been incorporated into the draft agreements.
The backbone of the proposed deal is a 20-point plan, he said.
There is also a framework document on security guarantees between Ukraine, European countries, and the US, as well as a separate document on bilateral security guarantees granted to Ukraine by the US.
Several provisions are being discussed, according to Mr Zelensky.
They include the Ukrainian army remaining at a peacetime level of 800,000; membership in the European Union; and European forces, under the leadership of France and the UK and with a "backstop" from Washington, ensuring "Ukraine’s security in the air, on land, and at sea".
"Some key countries will provide presence in these domains; others will contribute to energy security, finance, bomb shelters, and so on," the Ukrainian president said.
Ukraine is arguing that this bilateral document should be reviewed by the US congress, with some details and annexes kept classified, Mr Zelensky said.
The US team is now in talks with Russian envoys, and Washington has asked that no details be released, he added.
Read more: Latest Ukraine stories
Mr Zelensky said yesterday he met with his military commanders who reported that defensive lines are holding firm against the Russian onslaught.
"In (recent) weeks, the Russian army has significantly increased the intensity of attacks, and the number of Russian losses has increased accordingly," he said in a post on Telegram.
Ukrainian forces hit an oil terminal, a pipeline, two parked jet fighters and two ships in a series of strikes on Russian soil, officials said.
The killing of a top Russian general by a car bomb in Moscow yesterday, with investigators suspecting Ukraine was behind it, could be another instance of Kyiv picking surprise targets.
Ukrainian partisans also set fire to two Russian jet fighters in an operation on Sunday evening at a base near Lipetsk, a city in western Russia, according to Ukraine’s military intelligence.
Russia’s Ministry of Defence said only that its forces shot down 41 Ukrainian drones overnight, three of them over the Krasnodar region.
Additional reporting: PA
