If the other person trusts you, feel free to share your opinions about the situation in Ukraine (if you're looking for inspiration, here
are some ideas for that). However, confronting someone else's "facts" with yours often has a negative effect – when presented with opposing ideas, people often entrench further into their positions and narratives. This often escalates conflict in the conversation and, even if well-intentioned, often has the opposite effect than we hope.
It is extremely rare that you can "save" someone from their informational ecosystem by telling them that they are wrong. This usually happens only when people already have a deep trust in your judgment or if they believe that you have a similar set of goals or worldview as they do. They have to see you as an ally and not as a misguided friend or, worse, an enemy. Before presenting a different set of information than they're used to, it's helpful to try the following actions first.