GENEVA (Reuters) - The United States urged China on Tuesday to join trilateral nuclear arms talks with Moscow, calling Beijing's secrecy around growing stockpiles a "serious threat to strategic stability". 
U.S. State Department officials described Iran's blocking of a international nuclear inspector from accessing key nuclear sites last week as an "outrageous and unwarranted act of intimidation," a move that is raising concerns Iran is hiding undeclared nuclear materials. 
Iran sought to obtain illicit nuclear weapons technology as recently as 2018, according to new disclosures by German intelligence that reveal how Tehran tapped black weapons markets without the knowledge of international nuclear inspectors tasked with performing oversight on the Islamic Republic's weapons sites as part of the landmark nuclear agreement. 
Israeli leaders on Monday disclosed the existence of yet another secret Iranian nuclear weapons site that Tehran has attempted to hide from the international community, a disclosure likely to amplify calls from the international community for Iran to come clean about its ongoing weapons work. 
Iran is doing now in violation of the deal what it will soon be able to do with the international community’s blessing. 
The Trump administration, in a global first, issued sanctions on Iran's space program, which has long operated as a front for Tehran's advanced work on nuclear capable ballistic missile technology. An upcoming report by the United Nations’ nuclear watchdog organization, known as the International Atomic Energy Agency, includes new language suggesting the Islamic Republic has not been cooperating with international nuclear inspectors who are mandated to provide oversight on the Islamic Republic’s weapons program, according to multiple sources familiar with the contents of the report. 
The U.S. Strategic Command, in charge of waging nuclear war, has a new command and control facility in Omaha that will keep the name of a famous warfighting Air Force general. 
The 74th anniversary of the United States' nuclear attack on Japan came and went without comment from Sen. Elizabeth Warren (D., Mass.), who last week said during the Democratic primary debate that America must give up its ability to strike first with a nuclear weapon to "make the world safer." 
Washington Free Beacon editor Matthew Continetti said Friday that when it comes to United States foreign policy relations with Russia and China, "Nuclear politics is back." 