Britain and Finland will sign a new strategic partnership on Monday to strengthen ties and counter the "threat of Russian aggression", the UK foreign minister said.
The two countries will declare Russia as "the most significant and direct threat to European peace and stability," according to a Foreign Office press release.
The agreement will be endorsed by UK foreign minister David Cameron and his Finnish counterpart Elina Valtonen in London.
"As we stand together to support Ukraine, including through providing military aid and training, we are clear that the threat of Russian aggression, following the war it started, will not be tolerated," said Cameron.
"This strategic partnership, built on our shared values, will see the UK and Finland step up cooperation to bolster European security as well as seize new opportunities, from science and technology to closer energy ties," he added.
The countries will work together to counter Russian disinformation, malicious cyber activities and support Ukraine's recovery, reconstruction, and modernisation, according to the Foreign Office.
Since Russia's 2022 invasion of Ukraine, Finland has joined the NATO military alliance and shut off much of its border with Russia. Britain is a major military supporter of Ukraine.
