ikh vin . ▁The ▁ 4 6 th ▁Radio - Te chn ical ▁Brigade ▁at ▁Kh vo yn y ▁provided ▁rad ar ▁coverage ▁for ▁the ▁corps . ▁ ▁On ▁ 2 8 ▁May ▁ 1 9 8 7 , ▁the ▁forces ▁of ▁the ▁corps ▁were ▁alert ed ▁when ▁Math ias ▁R ust ' s ▁aircraft ▁appeared ▁on ▁Soviet ▁rad ar . ▁The ▁command ers ▁of ▁three ▁batt al ions ▁from ▁the ▁ 2 0 4 th ▁Brigade ▁reported ▁that ▁they ▁were ▁tracking ▁the ▁aircraft ▁and ▁were ▁ready ▁to ▁launch ▁miss iles , ▁but ▁they ▁were ▁not ▁given ▁permission ▁to ▁fire , ▁and ▁R ust ▁sli pped ▁through ▁the ▁air ▁defense ▁system . ▁ ▁Russian ▁service ▁ ▁The ▁ 2 1 9 th , ▁ 3 4 1 st , ▁and ▁ 9 6 7 th ▁Reg iments ▁were ▁dis band ed ▁in ▁ 1 9 9 3 . ▁On ▁ 1 5 ▁February ▁of ▁that ▁year , ▁the ▁ 1 6 9 th ▁Gu ards ▁Regiment ▁was ▁dis band ed ▁and ▁its ▁line age ▁transferred ▁to ▁the ▁ 8 6 th ▁Brigade , ▁which ▁briefly ▁became ▁the ▁ 1 5 7 th ▁Gu ards ▁Anti - A ircraft ▁Ro cket ▁Brigade ▁and ▁in ▁ 1 9 9 4 ▁was ▁red es ign ated ▁the ▁ 1 4 9 0 th ▁Gu ards ▁Anti - A ircraft ▁Ro cket ▁Regiment . ▁In ▁ 1 9 9 4 , ▁the ▁ 2 0 4 th ▁Brigade ▁was ▁re organ ized ▁as ▁the ▁ 1 4