為烏克蘭帶回關鍵情報的丹尼斯·鮑里索維奇·基里耶夫,早年從基輔工學院(National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”;簡稱:NTUU KPI)畢業,獲得了管理和市場營銷學位。後又從荷蘭銀行學院學習,獲得了資金管理和資本市場等學位。先後在烏克蘭里昂信貸銀行、烏克蘭花旗銀行、烏克蘭ING銀行、烏克蘭國家進出口銀行、烏克蘭國家儲蓄銀行擔任管理職務。
他和烏克蘭國家安全局局長伊萬·巴卡諾夫(Ivan Hennadiyovych Bakanov;烏克蘭語:Іван Геннадійович Баканов;1975年5月2日。2019年至2022年擔任烏克蘭安全局局長,是澤連斯基童年時的朋友)關系密切,可以隨時隨地進入伊萬·巴卡諾夫和烏克蘭國防部情報總局局長基里爾·阿列克謝耶維奇·布達諾夫(烏克蘭語:Буданов Кирило Олексійович;羅馬化:Kyrylo Oleksiyovych Budanov,1986年1月4日,自2020年8月起擔任烏克蘭國防部情報總局少將局長)的辦公室。他和前烏克蘭國家安全和國防委員會秘書安德烈·彼得羅維奇·克柳耶夫(Andriy Petrovych Klyuyev;烏克蘭: Андрій Петрович Клюєв;俄語: Андрей Петрович Клюев,1964年8月12日,又名安德里-克柳耶夫,烏克蘭商人和政治家,2011年被Korrespondent評為第七屆 “烏克蘭最有影嚮力的人”)家族有密切利益關系。安德里·克柳耶夫,因被指控破壞烏克蘭的民主在2015年被美國列入制裁名單。克柳耶夫加入了莫斯科的烏克蘭傀儡政府,作為準備俄羅斯獲取勝利後,替換烏克蘭民選政府的替身。
Later in his career, Gen. Budanov said, Mr. Kiryeyev had cultivated ties with European intelligence services, as well as with Russian military and government officials. He also agreed to represent Kyiv in early cease-fire talks between Russia and Ukraine, a risky, high-profile assignment. Mr. Kiryeyev “enjoyed playing the 007 role,” a friend said.
…On Feb. 18, the night before Mr. Kiryeyev had planned to leave Ukraine for an annual ski trip in the French Alps with his wife and a son, he arrived home late. “I won’t go,” Mr. Kiryeyev told his wife. She tried to change his mind.“If I left for vacation,” she recalled her husband saying, “I wouldn’t be able to look myself in the eye.” She and her son flew to France without him
...Five days later, on the afternoon of Feb. 23, Mr. Kiryeyev handed Gen. Budanov fresh intelligence: Russian President Vladimir Putin had just given orders to invade in the early morning.Mr. Kiryeyev also knew the main point of attack, Gen. Budanov said.At 8 a.m. on Feb. 24, low-flying sorties of Russian attack helicopters landed troops at Antonov Airport, several miles north of Kyiv. The Kremlin had planned to commandeer the airport to fly in troops and equipment for an assault on the capital.Mr. Kiryeyev’s tip gave Ukraine a precious few hours to shift troops to counter the Russian assault, Gen. Budanov said. After a fierce battle with the Russians, the airport was damaged beyond use by the invading forces.
Non-performance (improper performance) of official duties, which caused human casualties or other serious consequences or created a threat of such consequences, is the basis for the removal of such a serviceman from the performance of official duties.