ian ▁Border ▁Guard ▁District ▁that ▁at ▁time ▁was ▁involved ▁in ▁the ▁Soviet – A fg han ▁War . ▁ ▁After ▁the ▁war ▁and ▁the ▁fall ▁of ▁the ▁Soviet ▁Union , ▁he ▁returned ▁to ▁his ▁native ▁L viv ▁Border ▁Guard ▁det achment ▁where ▁in ▁ 1 9 9 2 – 9 4 ▁he ▁served ▁functions ▁as ▁a ▁chief ▁of ▁staff . ▁In ▁ 1 9 9 4 ▁to ▁ 1 9 9 5 , ▁he ▁was ▁a ▁chief ▁of ▁the ▁separate ▁border ▁check point ▁" P ry kar p att ia ". ▁From ▁ 1 9 9 5 , ▁Naz aren ko ▁was ▁a ▁staff ▁officer ▁for ▁the ▁North western ▁and ▁then ▁Southern ▁regional ▁administr ations ▁of ▁the ▁Border ▁Guard ▁Tro ops . ▁ ▁In ▁ 2 0 0 0 – 2 0 0 4 ▁Naz aren ko ▁was ▁a ▁chief ▁of ▁the ▁Az ov - Black ▁Sea ▁Regional ▁Administration ▁( initial ly ▁Crime an ) ▁of ▁the ▁State ▁Border ▁Guard ▁Service ▁of ▁Ukraine ▁and ▁head ed ▁the ▁operation ▁to ▁prevent ▁the ▁Russian ▁intr usion ▁to ▁the ▁T uz la ▁island ▁in ▁ 2 0 0 3 . ▁ ▁On ▁ 2 3 ▁October ▁ 2 0 1 4 , ▁President ▁Pet ro ▁Por os hen ko ▁appointed ▁Naz aren ko ▁head ▁of ▁the ▁State ▁Border ▁Guard ▁Service ▁of ▁Ukraine . ▁Naz aren ko ▁res igned ▁from ▁this ▁position ▁on ▁ 2 5 ▁July ▁ 2 0 1 7 ▁because ▁of ▁health ▁issues . ▁Four ▁days ▁earlier ▁Naz aren ko ▁faint ed ▁during ▁a