The European Union (EU) while believing the Syrian government responsible for chemical attacks in Damascus has urged that any planned international responses are taken through the UN process and held off until the UN report is published.
See here for the EU’s full statement. Extract reproduced below:
"On 21 August, a large-scale chemical attack was perpetrated in the outskirts of Damascus, killing hundreds of people, including many women and children. That attack constituted a blatant violation of international law, a war crime, and a crime against humanity. We were unanimous in condemning in the strongest terms this horrific attack.
Information from a wide variety of sources confirms the existence of such an attack . It seems to indicate strong evidence that the Syrian regime is responsible for these attacks as it is the only one that possesses chemical weapons agents and means of their delivery in a sufficient quantity.
In the face of this cynical use of chemical weapons, the international community cannot remain idle. A clear and strong response is crucial to make clear that such crimes are unacceptable and that there can be no impunity. We must prevent creating a dreadful precedent for the use of chemical weapons in Syria again, or elsewhere.