In the conflict-ridden realm of international relations, certain terms are particularly useful, and one of them is “Red Lines.” Derived from the concept of a “line in the sand,” first employed in antiquity, the term “Red Lines” appears to have emerged in the 1970s to denote what one nation regards as unacceptable from other nations. In short, it is an implicit threat.
Vladimir Putin, self-anointed restorer of the Russian empire, has tossed about the term repeatedly in recent years.