Certain people from regional countries were taking part in formation of the “higher military council” and none of the coalition leaders were invited in the meetings, al-Khatib said in an interview with Al Jazeera aired on Sunday.

“When the higher military council was formed, none of the leaders of the coalition were invited to attend its meetings while some people associated with regional countries were attending them. And we had no idea what was going on,” he said.

Asked if by “certain countries” he meant Saudi Arabia and Qatra, al-Khatib said “why are you asking about something that is well known to you?’.

Deepening rift among the Syrian opposition groups and foreign countries interferences in decision makings threw the opposition into a turmoil that made many of them frustrated with their internal politics.

“The people inside have lost the ability to decide their own fate," al-Khatib said.

"Matters have now reached a point that it is no longer acceptable. I have become only a means to sign some papers while there are hands from different parties involved who want to decide on behalf of the Syrians,’ he added.

Syria has been struggling with a Western-backed insurgency which began in March 2011 as a protest movement but turned to become a cover for terrorist groups including al-Qaeda-affiliated al-Nusra Front.

The government in Syria has repeatedly said that there are certain foreign countries that support the deadly insurgency in Syria, sending in militants and providing the insurgents with heavy arms to overthrow the legitimate government of Syrian president Bashar Assad.

“There are many things I do not agree with and there were ambiguous agreements that I think were not in the interest of the Syrian people.”

Al-Khatib announced his resignation in March, citing lack of international support for the rebels, but the move comes against a backdrop of deep rifts in the Western-backed coalition.he is folrmally stepping down by the end of the week.