sentences:  Boldin, were ordered into "battle ready" state in the spring of 1940.Soviet troop concentrations along the Romanian border took place between April 15 and June 10, 1940.In order to coordinate the efforts of the Kiev and Odessa military districts in the preparation of action against Romania, the Soviet Army created the Southern Front under General Georgy Zhukov, composed of the 5th, 9th and 12th Armies.