First, ECM, it was used by B-47s and 52s from the late 50s onward. It will fill the radar screen with false targets and noise and made the bomber hard to lock.
In the MiG-19P radar control panel there is a switch which is labeled "Jamming". It will reduce the jamming to a thin line, giving bearing to the bomber, kind of a HOJ mode.
Second,
They are very dangerous, it will depend on your attack profile and tactics to avoid them.