Boris Johnson will confirm £35 million of UK support for Ukraine in an effort to counter the influence of Russia.
At a summit in Copenhagen, the Foreign Secretary will join international counterparts in an aim to bolster support for Ukraine.
The money will go towards projects to support Ukrainian defence reform, promote peace-building and eliminate corruption, the Foreign Office said.
The package also includes £5 million this year to help Ukraine counter Russian disinformation.
The UK is already supporting Ukraine's public broadcaster, helping Ukrainian schools build resilience against disinformation and funding for an NGO network across Europe to expose fake media stories.
Mr Johnson said:
"With Russia continuing its efforts to destabilise Ukraine and the occupation of Crimea ongoing, Britain must help to lead the way on ensuring Ukraine has a bright, stable and prosperous future.
"That's why we continue to provide support, which will help Ukraine to build on the progress it has made since 2014 and on key reforms since the inaugural London Reform Conference last year.
"We do all this because it is essential for Ukraine's future security and prosperity, and because it is essential for upholding our European values, our security and our prosperity."