E, I’m assuming these missiles can only be brought in by ship. I imagine it could be done overland, but would need the permission of the involved countries.
If it’s brought in by ship, I’m assuming it will not have a big sign on it saying “missiles on board.” Russia would be cautious about deceiving countries on an oveland shipping rout, though.
There's basically no way the missiles could be shipped in without being spotted.
Keep in mind there are many different kinds of advanced missiles - Anti-Air, Anti-Ship, ground to ground, etc. The articles is referencing one type of anti-air missile.
Would take several trips.