MOSCOW — The Ukrainian Parliament refused on Friday to accept the resignation of its leader and instead adjourned for the summer, leaving uncertain the fate of a contentious bill that would allow local and regional governments to grant official status to Russian and other languages, in addition to Ukrainian.

Volodymyr M. Lytvyn, the chairman of Parliament, has refused to sign the bill, effectively blocking it from reaching President Viktor F. Yanukovich, who could sign it into law. Instead, Mr. Lytvyn submitted his resignation, challenging the Party of Regions, which holds the majority, to choose a new chairman who would let the bill go forward.

The measure was adopted Tuesday in a move by the Party of Regions that was so unexpected that Mr. Lytvyn was not even present for the vote.

Debate over the language bill has been so emotionally charged that it led to a brawl in Parliament in May. Hundreds of people demonstrated against the adoption of the bill this week, leading to violent clashes with riot police officers.