UN spokesman Martin Nesirky said Secretary General Ban Ki-moon is "deeply disappointed" at Iran's statements rejecting a 2012 communique adopted by international powers on ending the Syria war.
"Given that it has chosen to remain outside that basic understanding, he has decided that the one-day Montreux gathering will proceed without Iran's participation," Nesirky said at a press briefing yesterday.
Ban issued a surprise invitation on Sunday for Iran to attend the start of the Syria peace conference in the Swiss town on Wednesday.
Just before the UN announcement, Iran's UN envoy Mohammad Khazaee reaffirmed his government's rejection of the communique adopted in Geneva in June 2012.
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"Iran has always been supportive of finding a political solution for this crisis," Khazaee said in a statement.
"However the Islamic Republic of Iran does not accept any preconditions for its participation in Geneva II conference.
"If the participation of Iran is conditioned to accept Geneva I communique, Iran will not participate in Geneva II," he said.