electricity in the air. the air raid sirens have sounded. there's been explosions, rattle of gunfire and an urgency to the warnings, take to the shelters. this comes after an order for moscow to its forces to advance in all directions against kyiv. there is no let up in fighting. 0n the streets of kharkiv, a grim warning of what is to come if the conflict doesn't stop. russian troops roll in, but the ukrainian defence forces fight on. putin takes his next move. the world stops. war in ukraine and now russia's nuclear forces on special alert. russian state tv announce "our submarines alone are capable of launching more than 500 nuclear warheads guaranteed to destroy america and all of nato."