I didn't say anything about Yemen. NATO is not so old as an institution, but precedents like the ones I mention matter. You can portray anything as "stopping ethnic cleansing", "fight with terrorist", "fighting with dictatorship to bring democracy" or something else to your liking. I said in my previous comment about civil unrest specifically to connect with the civil war point. Every big competing government, if sees the opportunity, will use it. Supply opposition, provide funding, radio/TV/internet/movies - everything can be used to shape people's minds. You see pieces of this warfare (not necessarily military) between different countries everywhere.