A quick wikipedia search showed that the T-80u was introduced in '85 and had thermal imaging.
T-80U was introduced to field units around 1988. It did not have thermal imaging as standard.
Even the thermal imagers the Soviets did develop at the time had roughly the same range as Western Image Intensification - so the Soviet TI was markedly inferior to Western TI at the time. The absence of TI on Soviet AFVs is primarily due to cost.
Recently manufactured T-80Us and T-80UDs do have optional TI but this post-dates the year of fictional combat.