Following are reactions from world leaders on Saturday to the summit between U.S. President Donald Trump and Russian President Vladimir Putin, which did not resolve Moscow's war in Ukraine.

The White House says U.S. President Donald Trump spoke to Ukrainian President Volodymyr Zelenskyy after his summit with Russia’s Vladimir Putin in Alaska and also was talking with NATO leaders.

Zelensky’s trip to the British capital comes a day after he took part in virtual meetings from Berlin with President Trump and the leaders of several European countries.