The US vice-president, JD Vance, will face calls for greater consultation and coherence when he meets European leaders, including the president of Ukraine, at a security conference in Munich.

The timing of Volodymyr Zelenskyy’s meeting with US officials, initially scheduled for Friday morning, remained unclear because the US secretary of state, Marco Rubio, had to change his flight from Washington when the plane experienced a mechanical fault.

The expected showdown came after 48 hours in which senior members of the Trump administration, including the president, unleashed a volley of contradictory positions on how and when negotiations with Russia about Ukraine’s future would be conducted.

In an interview with the Wall Street Journal, Vance tried to quell criticism that Donald Trump had made a series of premature and unilateral concessions in a phone call with Vladimir Putin on Wednesday.

He said the US would still be prepared to impose sanctions on Russia if Moscow did not accept a satisfactory deal. “There are any number of formulations, of configurations, but we do care about Ukraine having sovereign independence,” he said.

Vance added the option of sending US troops to Ukraine if Moscow failed to negotiate in good faith remained “on the table”. He said there were “economic tools of leverage, there are of course military tools of leverage” the US could use against Putin.

Before being nominated as vice-president, Vance said he did “not really care about Ukraine’s future, one way or the other”.

Rubio added that the US had an interest in the long-term independence of Ukraine, remarks intended to imply some form of security guarantee for Ukraine.

Trump has also insisted that any deal would be in consultation with Ukraine, but he has been less emphatic about the involvement of Europeans – an omission that has infuriated leaders of the continent, who believe any Ukrainian settlement will have profound consequences for European security.

Trump reiterated that it would not be possible for Ukraine to ever join Nato since Putin would not accept it. In his view, Ukraine is aware of this. “I think that’s how it will have to be,” Trump said.

Instead, he foresaw Russia rejoining the G7 group of wealthy countries as part of its reintegration into western economies.

The US defence secretary, Pete Hegseth, who was due to meet his Polish counterpart in Warsaw on Friday, said the US was not making premature concessions.

(Source: The Guardian)