 The Polish–Lithuanian monarch decided to take advantage of the situation and demanded the return of territories conquered by Vasily III.In the summer of 1534, Grand Hetman Jerzy Radziwiłł and the Tatars devastated the area around Chernigov, Novgorod Seversk, Radogoshch, Starodub, and Briansk.In October 1534, a Muscovite army under the command of Prince Ovchina-Telepnev-Obolensky, Prince Nikita Obolensky, and Prince Vasily Shuisky invaded Lithuania, advancing as far as Vilnius and Navahrudak, and built a fortress on Lake Sebezh the following year, before being stopped.