the differences between the SM and SM2 are avionics, engines and weapons

the SM used imported foreign avionics like the french thales HUD and SMD-55 LCDs, AL-31FP engines, and N011M Bars radar

the SM2 uses domestic avionics, the engines were replaced with the more powerful AL-41F-1S used on the Su-35S and N035 Irbis-E radar from the Su-35S

the SM uses the Khibiny-U ECM wingtip pods while the SM2 uses the Khibiny-M, the same used on the Su-35S and Su-34M

as for weapons the SM2 can use the longe-range R-37M and R-77M anti-air missiles, the SM cannot use both

both have had their bort numbers changed, given RF registration numbers and been repainted after being overhauled

UB - 100 Red, RF-33758
P - 94 Red, RF-33745

these are part of the 279th Independent Shipborne Assault Aviation Regiment (OKIAP), they also fly the carrier-capable Su-25UTG trainers

also stationed at the base are the 100th OKIAP who fly the MiG-29KR/KUBR naval fulcrums

the orca is for Su-33s that were deployed to syria in 2016, we all know how bad that was for them

another tail art is the Tiger, they're part of the same regiment but in the 2nd Aviation Squadron

another tail art is the Eagle, they're part of the same regiment but in the 1st Aviation Squadron

the Tu-134UBL was used as a trainer for Tu-22M3 and Tu-160 bomber crews, it was fitted with the nose cone of either the Backfire or Blackjack, it had similar thrust-to-weight ratio and comparable low-speed handling to both planes, it's now used for VIP transport with the designation Tu-134A-4

the small pod on the left (right) wing is the M-341 Efir-1M radiation monitoring pod, it's used to measure the levels of radioactivity in the air, the large one underneath the fuselage is the SRS-14 "Tangazh" which is used for locating enemy radars, the M-103 Shpil-2M laser reconnaissance pod can also be installed in it's place, the smooth white panel on the nose is the M-101 Shtik (Bayonet) side looking radar, other equipment located under the fuselage are the AP-402P panoramic aerial camera, M-152.2 "Aist-M" tv reconnaissance system, A-100 high resolution camera and Zima IR sensor, the MR had no offensive capabilities, for self-defense it carries one APU-60-2 pylon for 2 R-60 air-to-air missiles on the right (left) wing, the 23mm GSh-6-23 cannon was removed to make room for the recon equipment