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 Lupul's opponents captured Iasi and installed Georgica on the Moldavian throne. The Ukrainian army, led by Khmelnytsky, came to Lupul's aid and defeated Stefan Georgica's 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 Battle of Finta and was forced to retreat. Trying to help his father-in-law, whose troops were surrounded by joint Wallachian-Polish forces in the Suceava Fortress (now Romania), Tymish, led by a 9,000-strong Cossack detachment, broke into the city on August 10.