A planned summit between U.S. President Donald Trump and Russian President Vladimir Putin was put on hold on Tuesday, as Moscow's rejection of an immediate ceasefire in Ukraine cast a cloud over attempts at negotiations.

A senior White House official told Reuters that "there are no plans for President Trump to meet with President Putin in the immediate future," after Secretary of State Marco Rubio and Russian Foreign Minister Sergei Lavrov had a "productive call" but opted against an in-person meeting.

Trump had announced last week that he and Putin would meet soon in Hungary to try to bring an end to the war in Ukraine. But Putin has been unwilling to consider concessions. Moscow has long demanded that Ukraine agree to cede more territory before any ceasefire.

European leaders called o

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