Putin is tightening his grip over what's left of the Wagner Group

• The Kremlin ordered Yevgeny Prigozhin's death in a plane crash last August, according to reports.
• Moscow has since worked to absorb Wagner's empire and militia in Ukraine and Africa, analysts said.
• The Wagner Group has become "marginalized" and "de facto'' subordinated to Russia, one analyst said.

Vladimir Putin reportedly ordered Yevgeny Prigozhin's demise last year — and he's now trying to do the same to his mercenary group.