Doing so would require the Russian leader to “accept the failure of sitting down with a president he considers a joke from a country that doesn’t exist”

Geneva, Istanbul and Budapest have been put forward as potential locations - but bilateral talks still remain a long way off.

By Andrew Osborn and Mark Trevelyan MOSCOW (Reuters) -Russian Foreign Minister Sergei Lavrov said there is no agenda for a potential summit between Russian President Vladimir Putin and his Ukrainian counterpart Volodymyr Zelenskiy,