Warning: Spoilers ahead for The Diplomat season 2, episode 1, “When a Stranger Calls.”Netflix’s The Diplomat is filled with political terminology that speeds by so quickly that it can be easy to miss, and the season 2 premiere includes one such term without ever really describing it in any detail. With The Diplomat season 2 cast being a blend of British and American characters – among other nationalities – several buzzwords from each country involved can refer to complex political processes. In The Diplomat season 2, episode 1, “When a Stranger Calls,” Rory Kinnear’s British Prime Minister, Nicol Trowbridge, calls a meeting known as a COBRA – which is a very specific kind of gathering.

https://screenrant.com/what-is-a-cobra-the-diplomat-explained/