Protesters have left Ukraine's justice ministry after their storming of the building led the minister to threaten a state of emergency - but they have continued to picket outside as they press for the president's resignation and other concessions.
The protesters still occupy three sizable buildings in Kiev city centre, including the city hall.
Justice minister Elena Lukash said she would ask the national security council to impose a state of emergency if the protesters did not quit the building, but she did not specify a deadline for leaving and it was not clear if the move outside would satisfy her.
Imposing a state of emergency would have been likely to cause more anger among protesters, who have clashed with police repeatedly over the past week, while three have died.
Ms Lukash, in a televised statement, said the "so-called protesters" seized the building as ministry employees were working on measures to grant amnesty to demonstrators and to make changes in the constitution to return the country to a system where the prime minister's powers are stronger.
Beleaguered President Viktor Yanukovych on Saturday offered the prime minister's post to Arseniy Yatsenyuk, one of the opposition's most prominent leaders. Mr Yatsenyuk, while not flatly rejecting the offer, said protests would continue and that a special session of parliament called for tomorrow would be "judgment day".
It is not clear if constitutional changes will be on the agenda for that session, but granting more power to the prime minister could sweeten the offer and allow Mr Yanukovych to portray himself as seeking genuine compromise.
The prospect of a state of emergency comes after other official statements suggesting the government is considering forceful moves against the protesters in the wake of the violent clashes with police over the past week.
Three protesters died in the clashes, two of them after being shot and the third of unspecified injuries. Authorities have said police do not carry the sort of weapons that allegedly killed the two men who were shot.
Interior minister Vitali Zakharchenko, one of the figures most despised by the protesters, on Saturday warned that demonstrators occupying buildings would be considered extremists and that force would be used against them if necessary.
He also claimed demonstrators had seized two policemen and tortured them before letting them go, which the opposition denied and called a ruse to justify a crackdown.
The protests began in late November when Mr Yanukovych shelved a long-awaited agreement to deepen ties with the European Union and sought more support from Russia. The demonstrations grew in size and intensity after police violently dispersed two gatherings, and demonstrators then set up a large tent camp in Kiev's main square.
Anger boiled over into clashes on January 19, days after Mr Yanukovych pushed through harsh new anti-protest laws. Protests also spread into other parts of the country, including some cities in the Russian-speaking east, the base of Mr Yanukovych's support.
Ukraine's government has no immediate plans to declare a state of emergency, its foreign minister said later, despite persistent fears that authorities were preparing to end spreading protests by force.
"Today, such a measure is not on the table," Leonid Kozhara told journalists.