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A US official said Yermak was scheduled to meet with US Secretary of State Marco Rubio on Wednesday.
Trump later responded in terms critical of Putin.
The direct appeal to Putin came after Ukrainian President Volodymyr Zelensky urged his allies to put Russia under more pressure to halt its invasion.
US officials were frustrated by Ukrainian President Zelenskiy's comment this week that Trump's special envoy, Steve Witkoff, was "spreading Russian narratives."
Russian ballistic missiles slammed into the heart of the northern Ukrainian city of Sumy.
Russia has used Iranian drones as well as North Korean missiles and artillery shells on the war front.
Russia denies targeting civilians, but thousands have been killed and injured in its invasion of Ukraine since 2022.
Trump has spoken of imposing sanctions on countries that buy Russian oil if he feels Moscow is blocking a peace deal on Ukraine.
The comments by Deputy Foreign Minister Sergei Ryabkov suggest Moscow and Washington have so far been unable to bridge differences.
.The Kremlin stated that the agreement, reached between Russian and US officials, is set to take effect from March 18 for an initial 30-day period.
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