Interior Minister Arsen Avakov said in a January 12 post on Facebook that the unidentified man was arrested along with an unspecified number of other people who were also allegedly linked to the October 2017 attack on Adam Osmayev.

He gave no further details.

Osmayev was wounded in the October 2017 attack on Kyiv's outskirts that killed his wife, Amina Okuyeva.

Four months prior to that attack, Osmayev was targeted in a separate incident during a meeting with a man who was posing as a French journalist.

The man then opened fire as they sat in a car, wounding Osmayev, he later told police. His wife, who was also in the car at the time, returned fire, wounding the alleged attacker.

Ukrainian police later identified the alleged shooter in the June attack as Artur Denisultanov-Kurmakayev, a Russian national who went by the nickname "Dingo." Authorities were looking into how he obtained a Ukrainian passport.

Denisultanov was turned over to Russian authorities on December 29, 2019, in exchange for a number of Ukrainian prisoners held in Russian detention or in detention of Russia-backed separatist fighters in eastern Ukraine. It was one of two major prisoner swaps that Ukrainian President Volodymyr Zelenskiy has pushed through as part of an effort to ease tensions with Russia.

Osmayev first made headlines in Ukraine in February 2012 when he was detained and charged with illegal explosives possession, damaging private property, and forgery.

At the request of the Russian authorities, he was charged with plotting to kill Putin, and Moscow sought his extradition.

Kyiv ultimately refused to extradite him, and he was then released from Ukrainian custody in November 2014, after more than 2 1/2 years in jail.

Three months after his release, Osmayev assumed command of a volunteer battalion fighting separatists in eastern Ukraine.

His wife, Okuyeva, gained renown working as a medic during the street protests in Kyiv that culminated in violent clashes with police in February 2014, and the ouster of then-President Viktor Yanukovych.