There is a piece of Natasha that's concerned that Bucky would have been pitted against Alexei at some point during his time under HYDRA's fist. Though she does think the chances are pretty slim, given Alexei's...predisposition to bragging.

"It's a little more complicated than that. He is a super soldier, though." Her mouth twitches into a small smile. "Always seem to have at least one of you in my life in some way."