MOSCOW — Vice President Joseph R. Biden Jr. in Kiev on Friday condemned Russia for its “unacceptable” military intervention in Ukraine, while exhorting Ukraine’s newly elected government to complete its democratic and anticorruption reforms.

During a joint news conference, Mr. Biden urged Ukraine’s president, Petro O. Poroshenko, to form a new government “in days, not weeks,” and to champion economic reforms, promote further economic integration with the West and root out what Mr. Biden called “the cancer of corruption.”

“Even if the guns in the east fell silent tomorrow, Ukraine would still face a struggle for its democratic and economic future here in Kiev,” Mr. Biden said on the first anniversary of the beginning of public protests that led to the former government’s ouster in February. “There is a lot of work to do in Kiev.”

One year after the Maidan, as the popular revolution is called in the country, Ukraine is mired in economic and military crises. Amid soaring inflation and capital flight, the $17 billion in loans promised to Ukraine by the International Monetary Fund “appears insufficient to close the external financing gap,” Timothy Ash, head of emerging-market research at Standard Bank, said in an investor’s note on Thursday.