The former heavyweight boxer has been at the World Economic Forum in Davos this week as part of a large Ukrainian delegation that is lobbying for more financial aid and modern weapons.

"Let's pay attention in two days," Klitschko told AFP on Wednesday, referring to a meeting of Ukraine's backers at the US-run Ramstein military base in Germany.

"I hope it will be very positive for Ukraine. Unofficially, I have very good and positive signals."

He added: "We need modern weapons. Ukrainian soldiers are very good motivated in this war but motivation is not enough. We need modern weapons to defend our homeland from aggression."

Amid rising pressure on German Chancellor Olaf Scholz to authorise the export of heavy German-made Leopard tanks to Ukraine, Klitschko said they "would be very helpful."

Scholz is set to address delegates in person in Davos later in the afternoon, with Ukrainian President Volodymyr Zelensky set to follow via videolink shortly afterwards.

Klitschko also paid tribute to Interior Minister Denys Monastyrsky who died in a helicopter crash outside Kyiv on Wednesday, calling him a "young, very creative, good person".

He said Monastyrsky was flying to the scene of a Russian missile attack on the city of Dnipro on Saturday when his helicopter came down, killing 16 people including three children.

"It's a big tragedy... In the next couple of days, we will know exactly the reason why this crash happened," he told AFP.