If you make a court under the UN and you trail US' adversaries' (Serbia) leaders (Milosovic), WHILE the US (who we know --thanks Snowden and Assange-- commits plenty of war crimes) does not recognize it: that is the definition of a kangaroo court.
Just for show. Just to provide some veil of legitimacy for the US actions to evil does without the US itself being held to the same standards.
So much for the ICC: a banana court.
It felt so real when Milosovic was trialed: now we all know the true nature of these show trials.