Serhiy Olehovich Velichko (Ukr: Сергі́й Оле́гович Вели́чко), nom de guere Chili, is a Ukrainian soldier in the Azov Brigade who fought in the war in Donbas and the Russian invasion of Ukraine as the commander of a reconnaissance battalion in the Kraken Regiment of the Ukrainian Army.

[1][2] He participated in Euromaidan, defending the protesters from titushky and Yanukovych's Berkut police.

[4][5] Velichko was sent to a pre-trial detention center in 2021 along with other members of the National Corps on suspicion of extortion and participation in a criminal organization.

[6] At the start of the Russian invasion of Ukraine, Velichko was released and sent to the front in the battle of Kharkiv.

Velichko created the intelligence and sabotage battalion of Azov alongside Konstyantyn Nemychev, which eventually became the Kraken Regiment.