The Russians have left because of radiation poisoning. Those soldiers will probably die. The UN IAEA will have to provide guidance to the Ukrainians to protect their lives while attempting to close down radiation leaks. The USA and EU must send experts to correct this impending disaster.
If USA soldiers and NATO troops have to accompany the experts then it has to be.
This is Russia. This is an international incident occurring because of Russia’s sustained ignorance of nuclear power and the hate of Ukrainians. Any Ukrainian that has become ill and/or died adds to the ongoing genocidal war.
This is Russia. It is unable to handle basic standards to avoid cataclysmic events.