He disclosed it to the Russian government, which is not necessarily improper. The US and Russian government share classified info all the time; they tried to warn us about the Boston Marathon bomber after all. Some #resist idiot who thinks he's a hero then leaked it all to various news outlets, doing way more damage. It thankfully seems that these agencies heeded the warnings of the US government that publishing the full details would be highly damaging, but I doubt that news agencies are equipped with SCIF-equivalents that would adequately protect the information from other prying eyes.