They aren't military commanders, or diplomats - they're both, and they're more. As ever, Jim takes every thing presented to him and has to look at it from a dozen angels in one moment. The military commander (destroy them) and the diplomat (make peace with them) and everything else. He's quiet, absorbing the weight of Kathryn telling him I allied with the Borg.

And then he squeezes her hand again. Firmer.

"That is incredible."

Serious, just as passionate as he was a moment ago speaking of the Romulans, this time directed at Janeway, looking at her with a laser-like intensity. Curious and inspired and motivated to support her, because fuck, it must have been a brutal decision to make.