President Trump has said Volodymyr Zelenskyy is prepared to give up Ukraine's claim to Crimea as part of a ceasefire deal to end his country's war with Russia.

Russian President Vladimir Putin announced a so-called "humanitarian" truce in the war against Ukraine to mark the 80th anniversary of the end of World War II in Europe, the Kremlin said on April 28.

Germany's defence minister has warned Ukraine not to agree to a deal which involves sweeping territorial concessions in return for a ceasefire with Russia. Boris Pistorius said Ukraine "should not go as far as the latest proposal by the American president", which he said would amount to a "capitulation".