Russia’s top diplomat said in an interview released on Friday that “there is no meeting planned” between President Vladimir V. Putin of Russia and President Volodymyr Zelensky of Ukraine. It was the Kremlin’s most direct declaration yet that a summit the White House had said was imminent was nowhere close to materializing.

“Putin is ready to meet with Zelensky when the agenda would be ready for a summit,” Foreign Minister Sergey V. Lavrov of Russia said in comments on “Meet the Press With Kristen Welker” that were released by NBC News.

“And this agenda is not ready at all,” Mr. Lavrov said.

Earlier this week, Karoline Leavitt, the White House press secretary, said that Mr. Putin had agreed to President Trump’s effort to broker a one-on-one meeting between the Russian leader and Mr. Zelensky, who has said repeatedly that he was ready to meet with Mr. Putin. Mr. Trump, on Fox News, said he was working to arrange the meeting because the leaders of the two warring countries may be “getting along a little bit better than I thought.”

But the Kremlin never confirmed the meeting. While Mr. Putin himself has said nothing about Ukraine since departing his summit meeting with Mr. Trump in Alaska last week, senior Russian officials told reporters in recent days that any Putin-Zelensky meeting would need extensive preparation before it could happen.

Mr. Lavrov, in his comments on “Meet the Press,” put that in the most blunt terms yet, but without ruling out the possibility of a future summit. Analysts have predicted that Mr. Putin would meet with Mr. Zelensky only if Kyiv agreed to bow to Moscow’s far-reaching demands on Ukraine’s territory and sovereignty.

“President Putin said clearly that he is ready to meet provided this meeting is really going to have an agenda, presidential agenda,” Mr. Lavrov said. “There is no meeting planned.”