Yes, IIRC there is still an international arrest warrant out for Girkin over MH17.
If Ukraine nabs him and hands him over to civilian authorities for that purpose, then it will be more than just a propaganda win - it will reinforce the idea at the United Nations that UNLIKE RUSSIA Ukraine is actually, at state level, abiding by the international rule of law.
What that then does is distance Kyiv from the actions of “rogue” soldiers who commit war crimes.
Russia pins medals on the chests of its Nazi war criminals. If Ukraine is seen to be prosecuting them through a transparent judicial process, OR handing them over to the Hague, then it’s yet another thing where Ukraine is seen to be respecting international law and Russia is ignoring it.
Dozens of Ukie war criminals have video evidence of their crimes filmed by themselves and nobody is in Hague so far.