With the pressure from its "friendly" neighbor China PR, seems like VNPAF will busy shopping for new toys to adapt to the defense demand of the country.
According to Wikipedia, VNPAF is still operating up to 34 Su-22 airframes, and they would be retired in the next 5 years.
Since the retirement of the Mig-21, VNPAF has been using the Su-22 with a similar mission to the Su-27 and Su-30. As you know, the Su-22 is not so good in a dog-fight standoff and it is aging, so VNPAF has been finding a replacement for already a decade. Of course, VN is still looking for a dozen attackers such as Su-34, but also many fighters including the JAS 39, F-16V (what?), and some more Su-27/30/35.
Some more fighters?
Not only to replace the Su-22 but also to strengthen the force. Rumors say no Su-35 but a dozen of Su-57? Look like a big leap from Vietnam
The Su-57 can be a replacement of the fleet of 11 Su-27 and to be the good comrades of the 35x Su-30. However, VNPAF can operate both the Su-27 and the Su-57 to increase its dogfight ability.
Su-34 (attacker), JAS-39, and Mig-35 are still big questions. Dassault Mirage 2000 can also be on the list by its ability to collaborate with the Su-30, and VN doesn't want to entirely depend on Russia.
Kawasaki P-3C Orion?
There are rumors that in the last meeting with the Japanese Prime Minister a few months ago, VN has committed to a few P-3C for anti-submarine mission?
The quad-jet Kawasaki P-1 is also under consideration for the same business.
This is the biggest hole in the Vietnamese Army. But is it necessary for VNPAF to acquire such an expensive system, while the modern system of on-ground radar can easily control the entire Vietnamese Airspace?
The highest possibility is the Airbus/CASA C-295AEW&C, but VNPAF can also acquire some Embraer or Saab as well.
VNPAF can also convert ex-Vietnam Airlines ATR 72-500 and Airbus A321-231 for AEW&C as well as for anti-submarine mission.
VNPAF is operating 3 airframes for cargo mission and obviously loving the type so much. The C-295 may have a bright future in the VNPAF fleet only with the transporting purpose but also AEW&C and anti-submarine. Not a surprise of VNPAF will order and operate some more dozens in the future.
Now have a look at the key fleet of VNPAF:
Su-30MK2V: 35x (1 crashed)
CASA/Airbus C-295: 3x
CASA NC212i: 3x
Antonov An-26: 30x, all grounded
Aero L-39 Albatros: 31x
Yakovlev Yak-130: 12x on order
How do you think about those?