On June 12, Henry Kissinger wrote in the Spanish paper El País:
Military intervention, humanitarian or strategic, has two prerequisites. First, a consensus on governance after the overthrow of the status quo is critical. If the objective is confined to deposing a specific ruler, a new civil war could follow in the resulting vacuum, as armed groups contest the succession, and outside countries choose different sides.
Second, the political objective must be explicit and achievable in a domestically sustainable time period. I doubt that the Syrian issue meets these tests. We cannot afford to be driven from expedient to expedient into undefined military involvement….
In reacting to one human tragedy, we must be careful not to facilitate another.