Actually GarryB, jets have a hard time fighting against helicopters.
Why do you think that?
Modern radars can see hovering helos from great distances and missiles like the R-77 can engage hovering targets within a few metres of the ground.
The only safe helicopter is hovering behind something like a tree or ridge line.
There are some researches about helicopters A2A capability, only defensive, but shows that it usually brings to fast movers great troubles to achieve a lockon and an engagement, not to mention kill.
There have been war games, tests and researches about that after Iran-Iraq war, which both russian (soviet) and US sight were suprised about the events.
I will provide the american source of US Army Command and General Staff College, School of Advanced Military Studies.
I will just screenshot, do not have patience to write it down.
It has to be noted that attack helicopters, come more often with Radar Warning Recievers than with any other sensor to warn the crew from threats, that making it more aware of possible Fighter aircrafts threats and procedure of masking themselfs among the ground clutter, which reduces their detection possibility and range very low, usually within visual range.
The other fact that Attack Helicopters, specifically speaking about russian, have a standardized requirement since the incident with the german intruder in his one engines cessna landing on red square in Moscow, which steered up quite some trouble and open eyes that fighter aircrafts had problems following, identifying and pursuing such targets, therefore only helicopters could fullfil this niche.
The capabilities in detection and weapons deployment of fighters have obviously increased in x-folds, but the disadvantages in detection and deployment of weapons have not changed in favor of fixed wing aircrafts.
the reason they fly low is concealment is their best option.
This tactic after being warned by RWR that fighters are fixing on helicopters is their only solution and the best solution to drag jets into WVR fights, which they do not dominate undisputed.
Helicopters have the enormous disadvantage of fighting from standing in a pit, while a fighter pilot is on the top of a parapet wall of a huge castle.
A PAK FA will be able to detect low flying or landing helos from huge distances and be able to engage them with long range missiles... most helos wont even see what hits them.
the helo... even if fitted with a modern AAM will be firing from low altitude and low speed which will dramatically reduce the effective range of the weapons... a fighter at medium altitude can see helos from enormous distances... hit them from long range, and are fast enough that the helo cannot escape and can fly high enough to be out of practical reach.
There is a reason there are no dedicated Air to air helos.
The only reason there are no dedicated Air-to-air helos is that they are to slow, low range and low altitude which means they could only hunt their own kind, slow,low flying targets on operational level, which they already do.