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.Putin says his ballistic missile attack on Ukraine is a warning to the West.These events are just part of what has been a week of escalation in the war between Russia and Ukraine. In recent days, Ukraine fired US-made ATACMS…