Disbanding the legislature would mean Ukraine's long-running attempt to form a coalition government had failed.
The country has been without a government since inconclusive March elections.
Parliament has been pressing Yushchenko to nominate Viktor Yanukovych, the leader of the pro-Russia Party of Regions and his main political rival, as prime minister.
RFE/RL Belarus, Ukraine, And Moldova Report
RFE/RL Belarus, Ukraine, And Moldova Report
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