In-universe, I think Pelia's accent is supposed to be a bit different from a "normal" Slavic accent since Nyota was able to identify her as a Lanthanite by her speech.
I think there's the potential for an argument to be made about Kane portraying a stereotype of Eastern Europeans, but I would want to hear from several (more than one or two) actual Eastern Europeans before I jump to that kind of conclusion.
I will say that some people have just expressed frustration at the presence of an Eastern European accent for being an Eastern European accent, which -- combined with the negative reaction a minority of fans had towards Babs Olusanmokun using his Nigerian accent as M'Benga -- makes me pretty uncomfortable. "United Earth" is supposed to mean United Earth, not the United Earth of America.
I think there's the potential for an argument to be made about Kane portraying a stereotype of Eastern Europeans, but I would want to hear from several (more than one or two) actual Eastern Europeans before I jump to that kind of conclusion.
I will say that some people have just expressed frustration at the presence of an Eastern European accent for being an Eastern European accent, which -- combined with the negative reaction a minority of fans had towards Babs Olusanmokun using his Nigerian accent as M'Benga -- makes me pretty uncomfortable. "United Earth" is supposed to mean United Earth, not the United Earth of America.