Ivan Kyrylenko, who heads the Yulia Tymoshenko Bloc, blamed some political forces for plotting to force the new vote, the UNIAN news agency said.
Speaking at a Supreme Rada session, Kyrylenko said as quoted by the agency that dissolution of the legislature could become a reality in a matter of days.
"Organizers, masterminds worked it [the vote] out in advance," he said without elaborating. He also warned of a likely low turnout ahead of New Year.
Political parties still have more than two weeks to form a ruling coalition after the alliance led by President Viktor Yushchenko and Tymoshenko, allies in the 2004 "Orange Revolution," formally split on September 16.
Yushchenko said Monday that early polls were very likely as political forces had been unable to come to terms.
Ex-Soviet Ukraine has been plagued by political instability since 2004. The previous parliamentary election took place last September.
The factions formerly within the ruling coalition, which also included the Supreme Rada's smallest group, led by former parliamentary speaker Volodymyr Lytvyn, have been talking about forming a new alliance since last week, with no agreement so far.
The pro-Western alliance fell apart due to infighting and more recently over differences regarding policy toward Russia in the wake of its armed conflict with Georgia last month.
The Communist Party, which has sided with the opposition Party of Regions led by ex-premier Viktor Yanukovych, urged parliament Tuesday to impeach the president over his stance on the Georgia conflict.
Party leader Petro Symonenko condemned Yushchenko's support for Georgia, which attacked breakaway South Ossetia, and Ukrainian arms supplies to the Caucasus state. He called Yushchenko's policies "anti-national."
