Russian language is as much a part of Ukraine as Ukranian is. You won't see many in the media calling it Kyiv before Ukraine turned nationalist under Poroshenko
or look at their tattoos and emblems --- I just cycled through the Reuters article linked in the OP body and picture 2/6 is of an azovite National Corps and picture 3/6 are UNA-UNSO nazis, whose members fought in every post-collapse struggle where they could shoot Russians and even fought alongside Salafi-jihadist and Al-Qaeda groups in Chechnya, and whose founding and most prominent members were real pieces of work
none of this is of course mentioned in the captions.