Good behavior would be to stay engaged with whoever's around you, stay engaged in conversation, show interest in conversation, and pretty much there aren't a lot of social faux pas that you can't overcome with just being an interested party. You know, the Ukrainians are very accepting and they really do like to ask a lot of questions. Don't be offended if they ask you about your pay; it's something they're interested in, or at least they were when I was there. They just like to know because they hear things. They're very well-read. They're very educated, so they know what is going on and they just want to confirm or deny whatever they've heard about the United States.
A military service member on best practices when conversing with Ukrainians.