SLOVYANSK, Ukraine (AP) — When shadowy commander Igor Strelkov appeared before the cameras recently in green combat fatigues and a clipped mustache, he did more than reveal the face of the insurgency rocking eastern Ukraine. He strengthened the case that Russia is behind the turmoil.

The commander did not address Ukraine and European Union assertions that he is a Russian intelligence officer. But he told journalists that he and his men entered Ukraine from Crimea, which Russia annexed in March after an insurgency that Russian President Vladimir Putin now admits involved Russian troops. Strelkov’s assertion that many of the insurgents are not locals undermines rebel claims that the insurgency is a spontaneous uprising, rather than a coordinated operation backed by outside forces.