Russia may expand and upgrade its nuclear arsenal if the United States continues to push ahead with the development of a missile defense system, a top Russian diplomat said in an interview ...

Last October, the Kremlin carried out an exercise that put its nuclear forces to the test, while Russian President Vladimir Putin has repeatedly threatened the use of nuclear weapons—going so ...

Russia had just helped broker the 2015 Iran nuclear deal, known as the Joint Comprehensive Plan of Action. Soleimani’s trip, disclosed three months later, took place in defiance of UN travel sanctions ...