The only judgement we will make is that a woman on the video looks like and talks pretty much like Savchenko, and a man on the video – is pretty much like Mr Ruban. Savchenko herself confirmed that the video is authentic, although she said that she "staged" these conversations knowing that she was being followed.
The video shows several conversations (recorded with a hidden camera or hidden microphones) that Ms. Savchenko had with the former hostage swap negotiator Volodymyr Ruban, who was arrested a few days ago on accusations of preparing massive terrorist acts in Kyiv.
Other participants in the conversations are named by the Prosecutor-General of Ukraine as servicemen Kit and Berezen. As stated, the conversations took place in November-December 2017.
Here is a short summary of the Savchenko-Ruban plan.
In another day's conversation Savchenko and Ruban test weapons given to them by separatists. The conversation goes: