Fedorov was tasked with modernising an army fatigued after more than four years of fighting Russia's full-scale invasion. He boosted salaries, announced plans for a partial demobilisation and introduced game-like rewards systems for the units that kill the most Russian soldiers.
But conflicts with the more traditional guard plagued his tenure, notably Oleksandr Syrsky, commander-in-chief of the armed forces.
Fedorov's dismissal triggered rare protests in Kyiv, Lviv and other cities across Ukraine.
At a press conference he convened in Kyiv on Thursday, standing in front of a large screen showing images of drones and in his trademark dark T-shirt, Fedorov defended his legacy and hit out at army chief Syrsky.
"All the initiatives we were proposing started to be blocked, and Syrsky ... is not ready to look you in the eye and openly talk about those problems," he said.
"The war has completely changed ... We can't keep going on what worked back then," he added.
From the outset, Fedorov – who never served in the army – clashed with the military's command and their traditionally stiff approach.
He held lengthy TED Talk-style briefings, dressed casually and engaged with journalists, trying to inject energy into Ukraine's war machine some four years into the Russian invasion.
'Forced to choose'
Fedorov contended that Syrsky had forced President Volodymyr Zelensky to choose between them.
Asked about the row, Zelensky acknowledged the two sides were barely on speaking terms, saying he had made the change for the sake of "unity".
Fedorov gained a good reputation with Ukraine's Western partners © JOHN THYS / AFP Appointed in January, the 35-year-old with short salt-and-pepper hair was Ukraine's youngest-ever defence minister.
He took over an apparatus facing stretched air defences, financial uncertainty, stalled peace talks, recruitment problems and widespread bureaucracy and war fatigue.
"We will turn the war into a data platform," he said, after being appointed in a speech punctuated with jokes.
"We will take all the data and see what works. Everything that works well will proceed," he said – a personal mantra that would not appear out of place in Silicon Valley.
He gained fans among Ukraine's Western partners, many of whom, including Palantir CEO Alex Karp, reached out following the dismissal.
'Outsmart the system'
Even before becoming defence chief, Fedorov spent much of the war promoting advanced technology, like drones, as a way to offset Ukraine's shortages in manpower, money and ammunition.
He began his career in digital marketing and his first roles in government were spearheading online services for citizens, including the country's now‑ubiquitous state services app Diia.
After the Russian invasion, he reached out to US tech titan Elon Musk to secure Starlink satellite connectivity for Ukrainian troops.
Fedorov's bet on drones seems obvious now in a war that has come to be dominated by them – but he was a rare and early advocate.
One of his other trademark initiatives was a killing-for-points scheme – a data-driven system designed to reward the most effective army units, which some in the system dismissed as gimmicky.
He also launched a series of reforms on procurement and air defence capacities but struggled to overcome Ukraine's everlasting mobilisation problems.
A June 2026 poll from the Kyiv Institute of Sociology found Fedorov ranked among the country's most trusted public figures.
"Fedorov increasingly came to be seen as a new political star and as the most successful reformer in the current government," Political analyst Volodymyr Fesenko told AFP.
"That may not have appealed to Zelensky," he added.
Shortly after Fedorov was appointed in January, his adviser and key backer Sergiy Sternenko said he was confident he could win over the military insiders to his new approach.
"Much depends on the military command, but Mykhailo has a vision of how to outsmart the system," he said.
It remains to be seen whether the system finally got the better of him.
(FRANCE 24 with AFP)
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