"Strelkov" bragging but he's right, it was him who did it: https://www.themoscowtimes.com/2014/11/21/russias-igor-strelkov-i-am-responsible-for-war-in-eastern-ukraine-a41598

"If our unit hadn't crossed the border, everything would have fizzled out — like in [the Ukrainian city of] Kharkiv, like in Odessa," Strelkov, who uses that nom-de-guerre meaning "Shooter" to replace his last name Girkin, was quoted as saying.