Currently exist "no arrangements" for US President Donald Trump to confer with Russia's Putin "in the near term", a White House official has declared.
This past week the US president said he and the Russian president would hold talks in Hungary's capital soon to address the Ukraine conflict.
A planning session between America's top diplomat Marco Rubio and his Russian counterpart Sergei Lavrov was planned for this week - but the administration clarified the two had had a "constructive" call and that a face-to-face session was not "necessary".
The administration withheld further information on why the talks had been postponed.
The US president had discussed a Budapest summit via telephone with the Russian leader, a just prior to meeting Ukraine's President Zelensky in the White House.
Certain accounts claimed his meeting with the Ukrainian leader had been a "contentious discussion", with those familiar claiming Trump had pushed him to give up large areas of Ukraine's east as part of a deal with Russia.
Nevertheless, on Monday Trump embraced a truce plan backed by Kyiv and EU officials to freeze the war on the current front line.
"Freeze the lines the way it is," he said.
Russia has repeatedly pushed back against freezing the present battle positions.
Moscow was exclusively seeking "permanent resolution", Lavrov said on this week, indicating that halting hostilities would simply constitute a brief pause.
The "underlying reasons" of the war required resolution, Lavrov said, using Russian diplomatic language for a set of extensive requirements that encompass the acknowledgment of full Russian sovereignty over the eastern region as well as the military reduction of the country – a unacceptable proposition for Kyiv and its EU supporters.
The Ukrainian president said conversations concerning the current lines were the "start of negotiations" but that Russia was "employing all tactics" to prevent dialogue.
He also said the only topic that could cause Russia to "pay attention" was that of the delivery of distance-capable munitions to Ukraine.
Putin's unplanned conversation with the US leader last Thursday preceded reports that the United States was preparing to send long-range Tomahawk missiles to Ukrainian forces that could possibly hit inside Russia.
Zelensky said it was the Tomahawks issue that had pressured the Kremlin to enter into dialogue. The talk about the missiles had proven to be a "significant input" in international relations", he commented.
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