They are focusing on missiles designed for Pak-Fa and they will be upgraded to go on earlier aircraft like Mig-29/35 and Su-27/30/35.
Their three known missiles... RVV-MD, RVV-SD, and RVV-BD seem to be upgraded versions of the R-73, R-77, and R-37M.
I rather suspect the only fundamental changes needed will be in their seeker technology... and I fully expect dual seekers with both IIR and passive/active radar homing options as standard.
I would think as scramjet technology matures that air breathing models will likely be developed too.
Against F-22 and F-35, they need an all new missile, not upgrading old design like R-27 with active homing head which is a good missile however. But it's better to have an all new missile.
I would say the opposite... the F-35 would require less performance than a late model F-15 or F-16 in terms of Kinematics to shoot down.
Improved sensors with dual modes would make things easier, but a new missile from scratch would not be needed.
The R-77 was designed from the outset for internal carriage and the R-73 and R-37s don't have large wing surfaces that would make internal carriage a problem...
It's clearly for marketing as Russian air force didn't order lot of them.
The Russian AF has ordered a lot of guided missiles in the last few years... I would suspect mostly for testing, but not for improving the export potential of the missiles themselves.
R-77M is a good direction of development, has a greater potential than the R-77 operation of grid fin
I would say the exact opposite.
The grid fins fold forward to take up very little space when carried internally... and in terms of flight performance the grid fins offer much better terminal manouver capability over small triangular fins that it is a joke.
Personally I would go with a short solid rocket booster package that extends to the rear of the missile that has external rear triangular fins for the launch and boost phase to a high altitude loft to the target area. When the missile starts to descend onto the target the rear fins can be ejected with the short booster section with the main rear grid fins popping out for the terminal phase of the attack maximising performance... low drag flight to target area and max manouver performance for end game.
Obviously the main missile engine would operate through the rear booster section with the triangular fins fitted to give full range.
Around 2004, the Russian Air Force said it had improved the R-73 type, and claimed to be a monochrome seeker
Almost all of the Russian R-73 is a two-color seeker, and the improved monochromatic seeker should be a focal plane imaging seeker
Their current Verba MANPAD has a three colour seeker... well actually three spectrum seeker... visible, UV, and IR to be precise.
Needless to say if you detect something in the IR range that also has a similar image in the visible range but not UV image then you have a genuine target (UV is mainly released by burning... ie flares, or enormous electric fields (high power electrical cables).