Kofi Annan has said he was frustrated by the "finger-pointing" at the United Nations.
But Washington has been quick to blame his resignation on the vetoing by Russia and China of draft resolutions on Syria. Moscow and Beijing have advocated a negotiated settlement of the Syria crisis, and opposed any foreign interference.
Meanwhile, news leaks reported that US President Barack Obama has directed the CIA and other US intelligence agencies to start helping the Free Syria Army overthrow Syrian President Assad. But the White House on Thursday again ruled out arming the opposition in Syria.
Regarding this issue, our correspondents in Washington have interviewed David Schenker, an expert with the Washington Institute for Near East Policy.
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Producer : Xinhua News Agency