If it was S-200 missiles, the range is barely 160 miles, so they would have had to mount them on some sort of water craft to hit anything near Rostov.
It looks like the crash site, reported to be in vicinity of Yeysk, is only about 100 miles from Ukraine held territory.
Multiple explosions reported this evening at the Novolipetsk Metallurgical Plant, the largest steel plant in Russia.