Soviet Union fighter aircraft have their glory days but you need to pinpoint the exact date and make the mission with the exactly right armament for both sides. You will rarely find a battle that includes all the arms in DCS World at one point in real time. There is a spread sheet made up on the forum here somewhere that pinpoints dates for the aircraft and armament you can use. Personally I think ED should do more job on presenting what is for any date in time, should maybe be a selection in ME so you only can choose between released armaments in the set date time.