US accuses Russia of breaching treaties with 'invincible' weapons

The United States on Thursday accused Moscow of openly breaching Cold War-era treaties by developing what Russian President Vladimir Putin called a new generation of "invincible" hypersonic weapons and submarines. Putin unveiled the new arsenal earlier Thursday in a state of the nation address, challenging Washington to a new arms race ahead of a presidential election that will all but certainly confirm his grip on power. Putin left his usual Kremlin perch to this year speak from a nearby exhibition center -- allowing him to show a series of video montages of missiles crossing mountains and oceans, heading over the Atlantic before striking the US eastern seaboard.