Special Operators. A few years ago they killed as many as 150 Russian Wagner Spetznaz, when they crossed an agreed upon demarcation/deconfliction line.
There are encrypted comms from the Russians, they were annihilated.
The Russians are in Syria at the invitation of the Syrian government; we are in Syria at the invitation of, well, us (which has always been okay to us).
If we are in the country illegally and we killed 150 people who are there legally, how did this not create an international stir?