KIEV, Ukraine — With a manhunt underway for the deposed Ukrainian president, Viktor F. Yanukovych, who was charged on Monday with mass murder, officials in Parliament pushed ahead with the monumental task of rebuilding the collapsed government. The country’s most pressing problem, however, is largely out of their control: a fast-approaching economic disaster that they cannot solve without international assistance.

The new speaker, Oleksandr V. Turchynov, admitted as much, warning in an open letter to the Ukrainian people on Sunday that “Ukraine is now in a pre-default condition and sliding into the abyss.”

On Monday, Parliament accepted the surprise resignation of Ihor Sorkin, the head of the Ukrainian National Bank, and approved a replacement, Stepan Kubiv, who said one of his top priorities would be to secure aid from the International Monetary Fund.