Seems like normally consequences for acts at the global level are more based on geopolitical considerations than moral considerations. I could imagine if India assassinated a US citizen the intelligence would have just been buried and nobody would have ever heard about it so the US could contribute building up the India relationship to use against China.
Which I've always had trouble with, because if you know that someone is immoral, then why are you trusting that they're going to care about your relationship with them?