In his earlier video statement Fedorov had argued that "people cannot endlessly live in a state where they do not understand why certain decisions are made".

He shied away from criticising the president directly and declined to answer whether he backs Zelensky to win any election.

Zelensky said he believed wartime elections would currently be too dangerous for Ukraine in remarks released on Sunday.

"I believe that in a war like this, elections as such are a huge risk," he said. "Elections right now are a tsunami for the country that will split Ukraine."

Experts have cited a number of obstacles to holding such a vote, including how soldiers, millions of Ukrainian refugees and people from occupied territories would vote, as well as disinformation threats from Russia.

Fedorov's video highlighting political corruption last week came the day before a money laundering investigation was announced into lawmakers and bankers.

Ukraine's anti-corruption bureau said it had uncovered a scheme to misappropriate more than $3m (£2.2m) in Ukrainian currency to pay bail for a former energy minister accused of money laundering.

A senior official in Zelensky's office, alleged to be involved, was sacked.

Fedorov criticised bureaucracy in the UK and other countries supporting Ukraine for delays in supplying weapons.

The UK is a longstanding supporter of Ukraine, spending £16bn supplying weapons since the war began. It was confirmed last week that British-made drones have been used to attack Russian targets.

Fedorov said he was grateful for British support but blamed "bureaucracy and red tape" for delays in receiving promised equipment.

"Governments are lagging behind the realities on the ground. It's not only the issue for UK, but for other countries as well that announce some assistance and we are not getting it until the end of the year."

Fedorov urged direct funding of the latest Ukrainian drone production, in place of outdated skills and equipment from other nations: "We don't need repairs of tanks when we no longer use tanks."

He said timely deliveries would help save not just Ukrainian lives.

"Unfortunately, our losses, our blood, our military experience is beneficial to all of you guys. You can get this experience for all the assistance that you give us."

Fedorov denied having immediate political ambitions but didn't rule out a future run for president.

"It will all depend on how soon we'll be able to relaunch this democratic election process, [...] how much energy I would have, whether I will preserve my team, whether I will be able to respond to the question myself, whether I can handle this position of the president or not.

"What's more important, is whether people will tell me, yeah, we can trust you handling that position."

Correction 23 August: This article originally said Mykhailo Fedorov's video highlighting political corruption was released the same day a money laundering investigation was announced into lawmakers and bankers. It has been corrected to reflect that the video was released the day before the announcement.