Russian and Ukrainian negotiating teams will again meet in Istanbul, Turkey, on Wednesday, Ukrainian President Volodymyr Zelenskyy confirmed, for the first such meeting since President Donald Trump set a 50-day deadline for a ceasefire to be reached.

Ukrainian President Volodymyr Zelenskyy said in his evening address on Monday that there would be another round of talks between Russia and Ukraine on Wednesday.

The parade is a day after Trump's 50-day deadline for Putin to make peace in Ukraine or face much tougher economic sanctions. Trump set the deadline on July 14, warning Russia that it faced punitive secondary tariffs against those still trading with it if there is no peace.

The Kremlin said on Monday that it did not rule out the possibility of a meeting between Vladimir Putin and Donald Trump if the Russian and U.S. presidents were both in Beijing at the same time in September.

The White House has made generous offers to meet Russian demands in a bid to secure an end to the fighting in Ukraine - but has so far got absolutely nowhere.