Ukrainian investigators are studying the debris of a new Russian intermediate-range ballistic missile that was fired at the city of Dnipro on Thursday, the first time such a powerful weapon has been used in the war.

The escalatory attack comes after Ukraine reportedly used US and UK long range missiles to strike targets inside Russia

Two days ago, Russian President Vladimir Putin announced a change in the country's policy for employing nuclear weapons in conflict. Then, on Thursday, Russia attacked the Ukrainian city of Dnipro with a new type of ballistic missile capable of one day delivering multiple nuclear warheads to distant targets with little warning.