Indeed a unified response by the international community is essential. So what is that: the international community? It certainly includes Russia and Iran, the two nations with close relations with Syria. Those two have the primary responsibility to react and deliver a message in the name of the international community. The USA -navy can't. With all respect, the USA military is not capable of delivering such a message, it is capable of bombing but not much more, and USA bombs will always provide a mixed, and not a clear message. The USA army is not fit to be a messenger of the international community.

It does not begin here but it is certainly a milestone.