Or Russia as a surface to surface as of this summer.
Listed surface to surface mode for S300 is 120km.
Want some real conspiracy theory?
Two missiles means they were launched from the same site. Two missiles failed to self-liquidate is not very probable, means they had the SL system disabled.
Now, even if there was a Russian missile - they were launched West and let to fall whereever it would be.
Note, AFAIR S300 has a radio commanded self-liquidation, in addition to a built-in one on altitude and miss.
If there was only one missile I could've believed it was a malfunction somewhere. Not with a two.