Yushchenko on April 2 signed a decree to dissolve parliament and call early elections after accusing lawmakers close to Yanukovych of illegally poaching deputies from pro-presidential factions.
The prime minister and his allies have strongly opposed early elections.
Yushchenko earlier today ordered prosecutors and police to take action against any official who refuses to obey his decree.
The Constitutional Court on April 17 is due to begin hearings on the decree's legality.
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