Władysław faced further opposition from a seemingly unlikely party: his father. When Żółkiewski returned to meet Sigismund at Smolensk in November of that year, Sigismund III changed his mind and decided that he could gain the Russian throne for himself. A majority of the Russians opposed the move, especially as Sigismund didn't hide his intent to Catholicize and Polonize the Russian Tsardom. Żółkiewski found himself in an awkward position – he had promised the boyars Prince Władysław to keep the Russian throne for Poland, and he knew that they would not accept Sigismund III, who was unpopular throughout Russia. However, he also had to explain this to his king, who was convinced, from his conquests in the west, of his popularity in Russia. Eventually, Żółkiewski, disappointed with Sigismund, returned to Poland. Sigismund eventually compromised and decided that he would allow his son to take the throne and that he would rule as regent until Władysław came of age. Thus, he required that the boyars who submitted and swore allegiance to Prince Władysław would also have to swear an oath to him. The boyars were more resistant to this request and support for the Poles eroded fast. Władysław was never able to take real power, and the war soon resumed. Sigismund and Władysław left the city for safer ground as tensions grew, and the small Polish garrison at the Kremlin soon became isolated and subject to increased hostility, as more and more of the formerly pro-Polish boyars began to change factions. The Polish forces outside Moscow under the command of Jan Piotr Sapieha clashed with the growing anti-Polish Russian forces of the so-called First Volunteer Army, led by Prokopy Lyapunov.