Former Ukrainian Prime Minister Yuliia Tymoshenko has close ties to former Georgian President Mikheil Saakashvili, who headed the UNM.
Ramazan Padiev and Batukhan Tochiev did not plead guilty.
The Ukrainian port city of Mariupol has been occupied by Russia since a destructive battle that killed tens of thousands of civilians in 2022.
Adam Kadyrov has said he is ready to find Zelenskyi and bring him to Chechnya if he receives the appropriate order.
According to Ukrainian media, Chechen Head Ramzan Kadyrov is in serious condition in a private hospital.
Ismail Hasanov spent six months fighting for the Wagner Group in Ukraine after being recruited from a Russian prison in 2022.
Ukrainian President Volodymyr Zelenskyi separately held a phone call with Azerbaijani President Ilham Aliyev following the strike.
