Trivia: When Yelena is talking about Alexei wanting to relive his glory days as the Red Guardian, she sarcastically calls him Crimson Dynamo. In the comics, Crimson Dynamo is one of Iron Man's enemies. Ivan Vanko from Iron Man 2 was partly based on this character.
Trivia: This film marks William Hurt's fifth and final appearance as Thaddeus "Thunderbolt" Ross. He died from prostate cancer the following year, and his role was recast with Harrison Ford moving forward.
Trivia: There is an extra scene after the credits with Yelena and Valentina Allegra de Fontaine at Natasha's gravesite.
Trivia: Nat keeps the blonde look and the vest from her sister Yelena, those are in Avengers: Infinity War.
Chosen answer: Are you talking about the woman who has the mind control antidote that ends up freeing Yelena from the Red Room's control? She's a rogue ex-Widow named Oksana played by martial artist and stunt coordinator Michelle Lee.
Bishop73
That's her. It's only a semi-resemblance, but was close enough that I basically assumed if that was Olga Kurylenko she'd had her role cut down, or was a cameo, or might appear in flashbacks. Either way I didn't spend the film thinking "when's Olga Kurylenko showing up?", and anyone asking that of themselves presumably might figure out who was playing Taskmaster before the big reveal. I might just be overthinking it of course. :-).
Jon Sandys ★
I actually thought it might have been Olga Kurylenko at first as well.
Phaneron ★