Syrian Kurds must be represented at peace talks in Geneva or they will fail, a Syrian Kurdish leader said on Friday, adding that one of the opposition groups involved, Jaysh al-Islam, had the "same mentality" as al Qaeda and Islamic State (ISIS).

"If there are some parties that are effective in this Syria issue who are not at the table, it will be the same as what happened in Geneva 2," Saleh Muslim, co-chair of the Kurdish Democratic Union Party (PYD) told Reuters, referring to failed negotiations in 2014.

"The negotiations and political solution will fail so we are keen to have everyone at the table."

He also accused Jaysh al-Islam (Islam Army), one of the groups within the Saudi-backed opposition council, of being no different to other radical Islamist groups. "Their mentality is the same as the Nusra Front and Daesh. They clearly want to establish an ISIS," he said.