Both Rostov's and Dnipropetrosk's ATC centers have spanish INDRA system (but different versions)
After rocket hit MH17 all A/C/S transponders stopped transmitting, but ATC system continued trying prediction of a/c track. Primary radar showed debris of either one or two biggest parts, and as well ATC system tried to predict their "movement". for example our system when does not receive any respond from target via primary/secondary radars "freezes" last target position for next 20 seconds. But I'm unaware how it work in Rostov's ATC system.