Ukrainian President Volodymyr Zelensky has said that working with Donald Trump if he is re-elected as US president will be "difficult work", but stressed that "we are hard workers".
In an exclusive interview with the BBC in London, Zelensky said he was ready to work with whoever will be in power in the US.
Just days ago, Trump announced Ohio Senator JD Vance as his running mate on the November ballot. The 39-year-old has said in the past that he "doesn't care what will happen to Ukraine".
His candidacy has fueled fears that US commitment to Ukraine could wane if Trump returns to the White House in November's election.
"Maybe he really doesn't understand what's happening in Ukraine, so we have to work with the United States," Zelensky told the BBC.
The Ukrainian leader is in the UK to attend a meeting of the European Political Community (EPC), where he gave a speech on Thursday afternoon.
The EPC, which includes the 27 members of the European Union as well as 20 non-members such as the UK, is an informal forum for cooperation.