Checked Yefim Gordon’s MiG-29 book, it says that chaff cartridges could be carried in countermeasures dispenser, but usually were not.

yes mostly flares he says

furthermore are the airborne jamming aircraft like Tu-22, su-24,yak-28 able to jam radars of enemy fighters ?

I mean the only way to do that is to create “sanitizied corridors” in which soviet ECM can jam all radars of friendly and unfriendly aircarft , so as to allow their strike planes to go through