Lets just say it like this: Poland has had very close ties to the United States for a very long time, and K. doesn't exactly love Russia, okay? As far as I recall, he even rejected an invitation from Russia (!) but I have to look into that a bit further because I'm not 100% sure.
Anyway, to give you guys a bit more perspective, here were the people on board:
Source: WikipediaThose killed included the President of Poland Lech Kaczyński and his wife; the Chief of the General Staff of the Armed Forces and other senior military officers; the President of the National Bank; the Deputy Minister of Foreign Affairs; government officers, vice-speakers and members of parliament; and senior members of clergy.
That's an interesting combination of people, isn't it? (Just saying).