A Downing Street spokesperson said:

The Prime Minister hosted President Poroshenko of Ukraine at Downing Street this afternoon for their first bilateral meeting.

They began by welcoming the strength of bilateral relations as we mark 25 years of diplomatic ties, and committed to working together to deepen our relationship in the years ahead.

The Prime Minister was clear that the UK recognises the threat posed by Russia through the illegal annexation of Crimea and the ongoing conflict in Eastern Ukraine, and noted that the UK continues to offer support to counter this threat.

They agreed on the importance of maintaining sanctions until the Minsk agreement is fully implemented, and of looking at how we work together to enhance our bilateral security and defence co-operation.

They also discussed Ukraine’s reform agenda, and the Prime Minister welcomed the progress that has been made so far. She confirmed that the UK government looks forward to holding a reform conference on 6 July, to maintain momentum and galvanise international support for Ukraine’s efforts.

The President thanked the Prime Minister for the close co-operation between our 2 countries, and invited her to visit Ukraine at her earliest convenience.

https://www.gov.uk/government/news/pm-meeting-with-ukrainian-president-poroshenko-19-april-2017