Hasta donde tengo entendido el Yak-130 incorpora un pequeño radar en su radomo.
The Yak-130 is fitted with the 8GHz to 12.5GHz Osa or Oca (Wasp) radar developed by NIIP Zhukovsky. The radar has the capacity to track eight airborne targets simultaneously, simultaneously engage four targets at all angles and simultaneously track two ground targets. The detection range against 5m² cross section targets is 40km in the rear direction and 85km in the forward direction. The lock-on range for operation in automatic tracking mode is 65km.
The radar, which has adaptive waveforms and sidelobes, has a surface mapping mode which includes image freezing and zooming on areas of interest.
An alternative radar fit is the Kopyo (Spear) radar. The aircraft can also be fitted with a podded Platan (Palm Tree) infrared search and track targeting system.
http://www.airforce-technology.com/projects/yak_130/