Kofi Annan announced his resignation as the special peace envoy for Syria on Thursday, the New York Times reported.
Annan said the Security Council was blame to his resignation. He said "finger-pointing and name-calling in the Security Council " was the reason for him to quit, Reuters reported.
"It is clear that President Bashar al-Assad must leave office," Annan said in an opinion article on The Financial Times, Reuters reported. He called the Syrian government's rule as "40 years of dictatorship."
"Kofi Annan deserves our profound admiration for the selfless way in which he has put his formidable skills and prestige to this most difficult and potentially thankless of assignments," Ban said, Reuters reported.
Ban Ki-moon, the United Nations secretary general, said Annan's successor will be appointed after his mandate expires, the New York Times reported.