Russia has already denied this!
The charge has been made before, back during the war.
The fact is, that Russians were there, and Russian trucks were likely used.
Reports of the convoys and sat pics are in hand.
I think it may have been a Russian repossession of the stuff they had not been paid for.
Where it went, is a good question, but the terrorists don't appear to have it. They have not used any of it as of now.
"Reports of the convoys and sat pics are in hand."
Didn't a convoy of Russian vehicles get attacked during the war? While it was on its way to Syria.