Russian investigators allege that Savchenko, who served in a volunteer battalion fighting with government troops against Russia-backed rebels, provided the coordinates for a mortar attack that killed the journalists in June 2014.
Savchenko, whose lawyers say was captured by the rebels and smuggled across the border into Russia, also is charged with entering Russia illegally.
She has become a poster child for Ukrainians fighting the separatists, and top Ukrainian officials have campaigned for her release.
