David Cameron to have talks with President Putin
David Cameron is to hold a bilateral meeting with President Putin after the D-Day remembrance services on Friday.
Downing Street said the UK prime minister would be sending a "very clear and strong message" about de-escalation of the situation in Ukraine.
The PM would stress the importance of developing relations between Russia and the government in Ukraine.
The meeting comes after President Putin criticised Prince Charles for comparing his actions in Ukraine with Hitler.
A former Polish war refugee, who met Prince Charles in Canada last month, said that as they discussed Hitler's takeover of countries, the prince "said something to the effect of, 'It's not unlike... what Putin is doing.'"
Clarence House said it would not comment on a private conversation.
The Russian president later called the Prince's comments "wrong" and "not royal behaviour".
There have also been differences between the UK and Russia over the situation in Syria.
The D-Day remembrance services on Friday are to mark the 70th anniversary of the Normandy Landings, when more than 156,000 Allied troops stormed the beaches of France and marked the beginning of the end of World War Two.