In the Ukrainian capital, Kyiv, demonstrators have clashed with city workers who were attempting to clear barricades and tents from the city's central Independence Square.
The protesters set fire to piles of tires and threw bottles and bricks at municipal workers.
Police and city workers eventually withdrew, leaving the situation unresolved.
The square -- known as the Maidan -- was the epicenter of massive antigovernment protests last winter which eventually saw the ouster of pro-Russian President Viktor Yanukovych.
Petro Poroshenko was elected as the country's new president in May, but several hundred protesters have remained on the square, saying they want to ensure the new government follows through on reforms.
Kyiv authorities have been negotiating with the protesters to clear the square since Vitali Klitschko was elected mayor in May.
Based on reporting by Reuters, ITAR-TASS, and AP