President Petro Poroshenko and Prime Minister Arseniy Yatsenyuk hastily arranged a meeting with ambassadors from the G7 nations after the envoys expressed deep concern at Aivaras Abromavicius's shock decision to step down.
Poroshenko held last-ditch talks with the Lithuanian-born minister yesterday in a bid to change his mind and reassure him that all his charges would be investigated in full.
But parliament began debating the 40-year-old's future in a tense session that saw one deputy raise the prospect of holding a vote of no confidence in the government as a whole.
Western frustration has been fanned by the fact that Abromavicius is the fourth reform-minded minister to tender his resignation since Ukraine's 2014 revolution broke its ties with Russia and set it on a European course.
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Parliament never approved any of their dismissals and they still remain acting ministers in their posts.
Yet the attempted flight of cabinet members charged with putting the war-scarred nation of about 40 million on a transparent path toward growth highlights the problems Ukraine faces in fulfilling its dream of joining the EU.
The Ukrainian leaders "assured us that they will work together, will work in unity for the reforms in the country," Japanese Ambassador Shigeki Sumi said on behalf of the foreign group.
But the European Business Association on Ukraine openly called the economy chief's resignation "an appalling symptom, which is likely to have very negative repercussions."
Abromavicius levelled his most serious charges against a top Poroshenko party member named Igor Kononenko -- a figure the Ukrainian media often refer to as a "grey cardinal" who implements the president's political will.
Abromavicius had tried to remove figures tied to vested interests from state corporations that have been bleeding money due to suspected corruption and complex offshore schemes.