Ukraine-Russia war latest: UK tells Russia it risks armed conflict with Nato after Trump vows to defend Poland and Baltics

European countries should be prepared to step in and fight with Ukraine if Moscow takes further military action, the Finnish president has said.

Alexander Stubb said that any security guarantees negotiated in order to bring the three-and-a-half year long war to a close would have to act as “a strong” deterrent for a future invasion by Moscow.

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German and Swedish fighter jets were scrambled on Sunday to intercept and monitor a Russian surveillance aircraft operating unannounced over the Baltic Sea, military officials have confirmed.

A Russian IL-20 reconnaissance plane was flying without providing a flight path or establishing radio contact, authorities said.

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If Russian planes violate airspace “every country has the right to defend itself and act accordingly,” EU foreign policy chief Kaja Kallas has said.

She also said there was limited time for a deal to be reached between Iran and key European powers to delay a return of sanctions on Tehran.

The White House has said Russia’s proposed one-year extension to the last remaining nuclear pact treaty limiting both countries’ nuclear weapons sounded “pretty good”.

Spokeswoman Karoline Leavitt said Donald Trump was aware of the proposal and wanted to make public comments on it.

The treaty was originally supposed to expire in 2021, but was extended for five more years, and is now due to expire next February.

Donald Trump is far from a shared UN vision, writes world affairs editor Sam Kiley:

The White House said on Monday that Russia’s proposed one-year extension to the last treaty limiting both countries’ nuclear weapons “sounds pretty good.”

Spokeswoman Karoline Leavitt said that US President Donald Trump is aware of the proposal and wishes to make public comments on it.

NATO is conducting “surveillance missions” over its eastern flank after a series of airspace incursions by Russian jets.

In a post on X, the organisation said it was conducting the mission to “ boost NATO’s vigilance”.

Russia has denied allegations it flew into Estonia’s airspace for 12 minutes on Friday.

President Donald Trump is set to hold a series of high-stakes meetings at the United Nations this week, beginning with bilateral talks with UN Secretary-General Antonio Guterres and leaders from Ukraine, Argentina and the European Union, White House spokeswoman Karoline Leavitt said.

In a separate multilateral summit, Mr Trump will convene with leaders from Qatar, Saudi Arabia, Indonesia, Turkey, Pakistan, Egypt, the UAE, and Jordan, Leavitt said.