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A contentious round of Syrian peace talks ended Friday with little or no progress towards ending the three-year civil war that has ravaged the country and left more than 100,000 dead.

Syrian foreign minister Walid al-Moualem blamed the “immaturity” of the opposition and “threats to implode” the talks.

Syrian Foreign Minister Walid al-Mouallem speaks at a press conference after peace talks to end the country's civil war ended in stalemate.MARTIAL TREZZINI / EPA

Along with other delegates representing the country’s president, Bashar Assad, he was unable to say whether the government would return for another planned round of discussions in 10 days’ time.

U.N. mediator Lakhdar Brahimi said "progress is very slow" but he thought there was more common ground than the sides recognized, although neither side budged an inch from their main positions.

While the opposition wants the talks to focus on a transitional administration it says will remove Assad from power, the government wants to talk about fighting "terrorism,” a generic term that it uses for all of its foes.

The sides also failed to achieve more modest aims, like an agreement to allow aid convoys into Homs, Syria's third largest city, where thousands of civilians are trapped with no access to food or medicine.

Earlier at a news conference in Berlin, U.S. Secretary of State John Kerry said Syria had no excuse for delays in ridding itself of chemical weapons, and urged it to move “very rapidly” to allow them to be shipped out of the country.

However one of Assad’s main backers Russia, rejected Kerry’s claims and said the June 30 deadline for the elimination of the weapons remained viable.

Reuters contributed to this report.