What does wire loops on the wall for?
I'm unsure of typical Russian construction techniques but this appears to be standard non-metallic house wiring cable. You need to determine if there is current available continuously or if it is switched somewhere. A non-contact circuit tester would help. You would not hang lights from this. My best guess is you somehow mount the fixture base over the spot and cut into the cable to connect the fixture in parallel. If the cable is unswitched, the fixture needs to have it's own switching provision.