It seems that the RWR on the Su-30SM2 is bugged. When an enemy aircraft is using its radar in my direction, the RWR doesn’t show anything, and I’ve even been hit by an AIM-120C missile out of nowhere.
I don’t know if this has to do with the type of aircraft using the radar against me, or with the vertical angle/coverage of the RWR when the enemy aircraft is flying slightly above me.
At first, I thought they were turning their radar off, but I noticed this has happened several times.