The Petrov Disintegration: Chronicles of the Imperial Rangers by Barbara J Robertson

The Great Empire was on the brink of destruction from an old Nemesis, Colonel Petrov. Not only were the Royal Palaces and the Family of the Great Benevolent Warrior Empress Kayla targeted; the ruthless criminal Petrov threatens to obliterate billions of people on three planets of the R’Genra Solar System.
The Empire enjoyed years of peace and tranquility under the reign of Empress Kayla, a true Golden Age. But the day of change arrived without warning. All the power of the Imperial Rangers, Military, and Scientists are called to action to save the solar system and the Empire which controls it.
Conspiring with formidable financiers and surviving rebels of the former Old Rebellion, Colonel Petrov positions his forces and weapons of mass destruction. Petrov’s goals are to taint the peoples’ love of the Empress while the destruction of the Great Empire and its people is executed from space.
Never has the Empire faced such a threat. The Imperial Rangers must spearhead the defense of Home World and the other planets, a task growing seemingly more impossible by the minute. Petrov controls the timeline. His plan must be stopped finally and completely by the Rangers. Failure is not an option.