Keir Starmer will sign a century-long partnership with Ukraine today, as the prime minister makes his first visit to the war-torn country in an effort to shore up support for Kyiv – just days ahead of the arrival of Donald Trump in the White House.

Sir Keir said the 100-year agreement underpinned Britain’s “steadfast support” for Ukraine as he reiterated European unity in the face of Russian aggression. The treaty and political declaration will be laid in parliament in the coming weeks.

“Putin’s ambition to wrench Ukraine away for its closest partners has been a monumental strategic failure. Instead, we are closer than ever and this partnership will take that friendship to the next level,” said the prime minister.

“The power of our long-term friendships cannot be underestimated. Supporting Ukraine to defend itself from Russia’s barbaric invasion and rebuild a prosperous, sovereign future, is vital to the government’s security and Plan for Change.”

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The PM’s visit is part of a wider effort on the part of European leaders to shore up support for Kyiv as they ramp up discussions over regional security ahead of the handover of power in Washington. President Volodymyr Zelenskyy met with Prime Minister Donald Tusk of Poland on Wednesday.

The flurry of diplomatic activity comes as the conflict between Ukraine and Russia has intensified ahead of the inauguration of president-elect Trump, with Vladimir Putin trying to take as much territory as possible ahead of expected peace talks.

On Wednesday, Ukraine’s state energy company was forced into emergency cuts after a massive Russian military attack.

Russia controls around a fifth of Ukraine after nearly three years of war and says any deal to end the conflict must take that into account.

In September 2022, it proclaimed four regions that it only partly controls as part of its own territory, which was condemned by the United Nations General Assembly (UNGA) as an “attempted illegal annexation”.

While President Joe Biden was steadfast in the US’s continuing support of Ukraine’s military effort, Trump has made it clear he wants to end the conflict quickly, hastening discussions about what a settlement might look like between Kyiv and Moscow.

In November, President Zelenskyy said for the first time in an interview with Sky News that Ukraine was prepared to temporarily cede territory to Russia to end the war if the conflict was frozen along current lines.

He added after a ceasefire was agreed, Kyiv could negotiate for the return of seized territory.

Sir Keir has also changed his tone, from insisting allies must “double down” on support for Ukraine for “as long as it takes” at the November G20 summit, to saying British policy was now “to put Ukraine in the strongest possible position for negotiations”.

The prime minister will want to reiterate to President Zelenskyy that nothing is off the table, as the duo discuss the ongoing conflict, the impending Trump presidency and what a settlement could look like.

As part of the partnership deal, the UK will bolster military collaboration on maritime security through a new framework to strengthen the Baltic, Black and Azov seas.

President Zelenskyy has reportedly told journalists the two leaders will discuss the possibility of British troops joining a post-war peacekeeping force, as other European leaders such as French President Emmanuel Macron – who visited the PM at his Chequers country residence last week – and Tusk have similar conversations.

Ukraine relies on US support to continue the conflict, given it provides the bulk of military aid. But Trump has made it clear he is reluctant to keep funding the war, saying during the election campaign he would end it “within 24 hours” of taking office.

He has subsequently acknowledged that ending the conflict will be more difficult, but his administration is keen to press ahead: Trump has said he will arrange a call with Putin soon after his inauguration on 20 January, while the new US envoy to Ukraine, retired lieutenant General Keith Kellogg, said last week he wanted a solution to the war in the first 100 days of office.

The discussion around peacekeeping forces is part of a wider conversation among European allies about what security guarantees should be put in place for Ukraine, including buffer zones and the threat of more weapons for Ukraine in the absence of NATO membership.

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President Zelenskyy has said any guarantees must be backed up by the US as the prospect of a NATO membership invitation fades from view.

Ukraine becoming a member of NATO is a clear red line for Moscow, with Putin describing Kyiv joining the security alliance as “an unacceptable threat”.

Last week, Trump acknowledged Moscow’s longstanding opposition to Ukraine’s ambition to join NATO, given it would mean “Russia has somebody right on their doorstep, and I can understand their feeling about that”.

European leaders are concerned Trump will force Ukraine into an unjust peace deal, and they will be shut out of the negotiations which will shape the security of the continent for many years.

NATO chief Mark Rutte last month cautioned Trump over his plans for a peace deal, warning it would lead to the West’s enemies “high fiving” and would only serve to embolden China, North Korea and Iran.

The PM has come under criticism from Conservative rivals for not visiting Ukraine sooner, with former defence secretary Grant Shapps saying he was “astonished” is has taken the PM six months in power to visit the country.

However, Sir Keir has met the Ukrainian leader six times, as well as hosting him twice at Number 10 since taking office in July.