Fictional character, a spy in the Marvel Comics Universe
Yelena Belova (Russian: Еле́на Бело́ва) is a fictional character appearing in American comic books published by Marvel Comics. She is depicted as a spy and was the second modern-era character to use the Black Widow name. Created by Devin Grayson and J.G. Jones for Marvel Knights: Wave 2 Sketchbook #1 (January 1998), Belova made her first appearance in Inhumans vol. 2 #5 (January 1999) by Paul Jenkins and Jae Lee. She was trained as a spy and assassin in the Red Room. Originally, Yelena was a foe of Natasha Romanova and was sent to kill her, but the two later became allies.
https://en.wikipedia.org/wiki/Yelena_Belova