 Complete the following phrase:  The alliance of Ukraine with the Principality of Moldavia caused concern among the Transylvanian Prince George II Rákóczi and the Wallachian lord Matei Besarab, who, uniting with the detachments of the candidate for the Moldavian throne of Chancellor logofet Gheorghe Ștefan, started a war against Lupul. In April 1653, a combined force of Vasily Lupuls opponents captured Iasi and installed Georgica on the Moldavian throne. The Ukrainian army, led by Khmelnytsky, came to Lupuls aid and defeated Stefan Georgicas troops near Iasi on May 1-2, 1653. Trying to strengthen his success, Khmelnytsky launched an offensive on Wallachia, but on May 17 he was defeated at the 