Ukraine's ousted defence minister Mykhailo Fedorov has given President Volodymyr Zelenskiy a deadline of August 18 to reinstate him to the post or face mass protests, in the most direct political challenge the president has faced since taking office in 2019.

"If our goal is to stop the war, then we are fighting for me to have the authority to do so as Minister of Defense. We have a point where we will understand whether this has been achieved or not," Fedorov said in widely viewed interview with blogger Serhii Sternenko posted pm YouTube over the weekend. August 18 is when parliament returns from recess and can vote on a new appointment.

The ultimatum lands as Zelenskiy's own standing erodes on several fronts at once. A Socis poll published on August 6 put him sixth in a public-trust ranking of Ukraine's political and military leaders, behind four military figures and Fedorov himself: only 18% of respondents said they fully trust Zelenskiy, against 26.8% for Fedorov and 27.8% for ex-commander-in-chief Valeriy Zaluzhnyi, who topped the poll. In a simulated run-off, Zaluzhnyi would beat Zelenskiy 47.4% to 24.2% and Fedorov would win 43.4% to 24.7%.

Corruption, not just the war, is also pulling at Zelenskiy's support. A separate poll published this month found 49.3% of Ukrainians see high-level government corruption as the biggest drag on the country, against 44.6% who cited the constant drone and missile attacks on infrastructure — a striking reversal for a country three and a half years into a full-scale invasion.

That backdrop was sharpened on August 3-5 when Zelenskiy dismissed Olha Stefanishyna, his ambassador to Washington and former EU-accession point person, only for the National Anti-Corruption Bureau (NABU) to notify her of a formal suspicion of illicit enrichment worth almost UAH14mn ($340,000) days later, over two undeclared Kyiv apartments and a car registered to a subordinate.

The political pressure is building alongside a brutal escalation on the battlefield. Russia struck Kyiv with ballistic missiles and drones overnight into August 8-9, killing at least four people including a three-year-old boy in the Pukhivka double-tap strike Zelenskiy himself described, while Ukrainian drones hit two Russian oil refineries and a further 12 Russian "shadow fleet" tankers in the Black Sea and Sea of Azov the same week.

Fedorov himself has gone furthest in framing the imbalance as a production crisis rather than a battlefield one. "Russia is now cranking out more missiles in a single week than Ukraine receives in months while American production still can't keep pace. That is not a supply chain hiccup, that is industrial base failure dressed up as policy," he said in the same Sternenko interview.

Facing mounting problems, Zelenskiy has begun to look increasingly desperate, and has been left scouring the world for interceptors as domestic air-defence stocks run dry.

Fedorov, who built his reputation pushing long-range, high-precision strike capability and 155mm deep-strike ammunition over the military's preference for shorter-range artillery, was pushed out in July's government reshuffle after clashing with commander-in-chief Oleksandr Syrskyi over battlefield priorities. He has said he handed his own war-fighting plan to acting minister Yevhenii Khmara and hopes it will still be implemented even if he is not reinstated.

Zelenskiy had reportedly considered calling elections this autumn, martial law permitting, but is understood to have dropped the idea after Zaluzhnyi indicated he would run against him and win the race.