International law is based on jurisdictional control based on sovereignty. Meaning that crimes committed in a country are handled by the country of origin, unless the countries in question have an extradition policy with each other.
For example, how do you think Americans would respond if China put out a warrant on Trump or any other American representative and then sent in a special ops team to extract them?
Even when looking at the situation purely from the American court system...... It's going to be a hard case for any prosecutor to really present. The warrant was put out by grand jury, where the justice department doesn't really have to present any real evidence and there is no defense.