As mentioned in the previous post, so-called experts were startled by what they saw happen in the Ukraine, and rushed to maintain the façade of competence by supposing that they have the tools to understand what happens.
Yet be warned, I already covered this years ago:
This almost six years old blog post was nicely complemented by the comments:
I think you've stumbled on the old phenonema where if an alleged expert sees something he had not seen before, it is therefore "new" and he gets credit for developing a paper on it. Additional research and agressive peer-reviews not required.
The term "Hybrid war" is already expanding. Some read it as "irregulars using regular methods", others as "regulars using irregular methods" and finally some simply use it as a replacement for the "full spectrum" buzzword of the 90's.
Now let's see whether Putin's ruse of using regular (para)military troops without proper identification and employ them in denied warfare against another power is anything new. If it was, the startled 'experts' might have a justification to talk of what happens these days as new, not old.
Ladies and gentlemen, I present you the 1st American Volunteer Group (AVG),
also known as the "Flying Tigers"!
Real combatants of the United States Army (Air Force), who went on a 'vacation' and served with American-built fighters in China to fight for China as mercenaries against Japan. They did so based on an executive order of the POTUS and totally did not use proper U.S.A.A.F. uniforms until the U.S. entered the war officially.
Well, maybe you're not satisfied by this example because they were merely in a country at war, but not invading. Well, in this case I propose you read up on foreign involvement in the Spanish Civil War.
Putin used the fig leaf of deniability to enlarge his freedom of action, to get away with invading a country as the US and UK did with the fig leaf of WMD lies in 2003. That's no new kind of war, no new style of war and no new theory of war is required, much less new buzzwords of war. Western 'hawks' are merely angry that they themselves didn't come up with it and that some other power was brazen enough to do it.
There's hardly anything surprising to you about the face of war(fare) once you've learned enough about military history, for there are few truly new things.