MOSCOW — A former prime minister of Ukraine said the country’s anti-corruption reforms are at risk of stalling just as the government has asked for a significant expansion in foreign aid to prop up the economy because of coronavirus shutdowns.

The Ukrainian government had already been deeply reliant on foreign assistance to halt Russia’s military intervention, an issue that became a focus of impeachment hearings in the United States last fall after President Trump withheld American aid. Now it is asking for funding because of the virus.

Much of Ukraine’s aid, including a pending $5.5 billion package from the International Monetary Fund, is tied to meeting anti-corruption benchmarks. Those have been slipping, putting assistance in doubt at a precarious time.

Oleksiy Honcharuk, the former prime minister, said in an interview that President Volodymyr Zelensky fired him and most of his cabinet earlier this month after he crossed the interests of a coterie of powerful insiders in the Ukrainian economy.