Ukrainian President Volodymyr Zelensky, in his increasing calls to get the US Congress to approve an aid package, has met US Vice President Kamala Harris and even invited former president Donald Trump and any other US lawmaker to the front lines.
"We are counting on this positive decision of the Congress," Zelensky said after meeting Harris on Saturday, the second day of the Munich Security Conference, an annual gathering of top political and defence officials to debate international security policy.
The aid package has been stalled in the Republican-controlled House of Representatives as Trump does not want the house to provide US President Joe Biden with any victories ahead of the November election.
Zelensky, at a joint press conference with Harris, said that for Ukraine "this package is vital".
His plea came as Ukraine's army said it has withdrawn from Avdiivka in eastern Ukraine after months of heavy fighting.
The Ukrainian leader stressed that his country is depending on further support from its most important ally and is deeply grateful for previous aid.
Zelensky declined to comment on the internal US political debates and upcoming presidential election, but did invite Trump or any other lawmaker to the front.
"If Mr Trump, if he will come, I am ready even to go with him to the front line," Zelensky said.
"We have to demonstrate (to) people who are decision makers, what does it mean? The real war - not in Instagram, real war."
NATO Secretary General Jens Stoltenberg more pointedly urged US Republican politicians to approve the military aid for Ukraine requested by Biden.
"Every week we wait means that there will be more people killed on the front line in Ukraine," Stoltenberg said.
"So it's not for me to give advice on how to pass legislation to the US Congress. But what I can say is the vital and urgent need for the US to decide on a package for Ukraine."
After long delays, the Senate recently approved plans for new Ukraine aid worth about $US60 billion ($A92 billion).
But approval in the second chamber is uncertain - especially since Speaker Mike Johnson has said he won't bring the bill to the floor.
Harris stressed the United States remained firmly behind Ukraine and Biden would continue fighting to deliver the needed aid to support the country in its battle against the ongoing Russian invasion.
Danish Prime Minister Mette Frederiksen criticised fellow supporters of Ukraine for being too slow and hesitant to supply the embattled country with the weapons it needs.
She said Denmark would soon deliver F-16 fighter jets to Ukraine and was still seeking more partners to supply the advanced fighter plans.
German Chancellor Olaf Scholz called on EU partners to follow Berlin's example and ramp up aid for Ukraine, saying it was in member states' own security interests to do so.
The discussions came one day after Russian dissident Alexei Navalny died in a Russian prison camp.
Many attendees at the conference and leaders elsewhere blamed Putin for his death.
