A top aide to a former Ukrainian president who was ousted during the 2014 Euromaidan Revolution was assassinated outside the gates of a prestigious school at Madrid on Wednesday morning, moments after dropping off his children.

Andriy Portnov, a Ukrainian politician who served as a senior aide to President Yanukovich, was repeatedly shot execution-style in front of the American School of Madrid in the tony neighborhood of Pozuelo, according to the Times of London.

Pornov was getting back into his Mercedes-Benz when two or three attackers ambushed him, police sources told a Spanish newspaper, El País. A spokesman for emergency services in Madrid told the newspaper that an eyewitness called to report finding Portnov lying unconscious on the ground. First-responders arrived at the scene to find him with “injuries incompatible with life after receiving at least three gunshot wounds.”

“One shot, the fatal one, struck him in the head, near the neck, from behind and slightly to the side; the other two hit his body, in the abdomen and on his side,” the same police source said to the newspaper.

Police sources told El País that investigators are looking into allegations that Portnov’s murder may have stemmed from a “debt problem.”

Portnov held multiple high-ranking positions at Kyiv throughout his political career, including in the legal department of the election headquarters of a former Ukrainian prime minister, Yulia Tymoshenko, between 2005 and 2010. He was later the head of the judiciary department for Mr. Yanukovych, a pro-Russian leader who was ousted in 2014.

In 2018, he was investigated for treason for his alleged involvement in the annexation of Crimea.

Portnov was also sanctioned by the U.S. Treasury Department in 2021 under the Magnitsky Act, which targets foreign nationals accused of corruption and human rights abuses. He was alleged to have used his “extensive connections” to bribe judicial and law-enforcement officials.