US military officials say Russia is massing its troops on Ukraine’s eastern border as it prepares for a major new offensive in the war. Satellite images show hundreds of military vehicles moving towards the eastern cities of Izium and Dnipro, with residents joining the 4.5 million Ukrainians who have fled west or across the border seeking safety, as dangerous as those options are. Ukraine President Volodymyr Zelensky warned that the coming week could be crucial, but experts say Russia is still struggling to execute its war plan. That could be behind Moscow appointing a new top commander, General Alexander Dvornikov, as part of a major military reshuffle. He has extensive experience in Ukraine’s Donbas region and was the first Russian air war campaign leader in Syria. The war is now in its 7th week, and the World Bank says Ukraine’s economy will shrink by 45% this year.