President Vladimir Putin said Friday that Russia will continue to test and start mass-producing the hypersonic ballistic ...

Putin warns Russia could use its new missiles against countries allowing Ukraine to fire their missiles at Russia ...

U.S. officials told NBC News that the weapon fired by Moscow at the eastern Ukrainian city of Dnipro was an experimental ...

A U.S. official said Russia has a limited number of the missiles and that it cannot regularly deploy them on the battlefield.