"The Secretary-General (Ban Ki-moon) has today received a letter from the Government of Syria, informing him that President (Bashar) Al-Assad has signed the legislative decree providing for the accession of Syria to the Convention on the Prohibition of the Development, Production, Stockpiling and Use of Chemical Weapons and on their Destruction of 1992," said a UN statement.
In their letter, the Syrian authorities have expressed their commitment to observe the obligations entailed by the Convention even before its entry into force for Syria, said the spokesman of the Secretary General.
Ban welcomed this development, noting that, as depository of the Convention, he has long called for universal accession to the Chemical Weapons Convention.
"Given recent events, he hopes that the current talks in Geneva will lead to speedy agreement on a way forward which will be endorsed and assisted by the international community," the UN statement said.
Chemical Weapons Convention requires all parties to declare and destroy all of the chemical weapons they possess. Syrian President earlier told Russian TV the papers were being sent and that it would submit weapons data one month after signing.
The US accuses the Syrian regime of carrying out chemical attacks against its own people in which more than 1,400 people were killed. The government denies the allegation, blaming rebels for the attack in the Ghouta area of the capital, Damascus, on 21 August.
The move came as US Secretary of State John Kerry and his Russian counterpart.