Again in 1616, Stefan Żółkiewski managed to cool the tensions, displaying Commonwealth military readiness and signing a new agreement with the new hospodar, Radu Mihnea, in Braha. He was promised Moldavian mediation in patching up conflict between the Ottoman Empire and the Commonwealth. Radu Mihnea pledged allegiance to the Polish king and promised not to allow the Tatars passage through his territory. However, northern and eastern wars with Sweden and Muscovy diverted the attention of the Commonwealth and strained its military might to the limit. In 1617, after yet another wave of Cossack raids, the Sultan sent a powerful force under Iskender Pasha to the Commonwealth borders. The army consisted of janissaries, Tatars, and vassal troops form Transylvania, Moldavia, and Wallachia (numbering up to 40,000). Żółkiewski met them near Busza (on the Jaruga River), but neither side could decide to attack, and letters between leaders had been exchanged since the start of Iskender's march. Żółkiewski had mostly magnate troops and no Cossack troops, as the Commonwealth waged war with Muscovy and with new Swedish aggression on Livonia at the same time, while the Ottomans were at war with Persia. Żółkiewski was forced to renounce all Polish claims to Moldavia through the Treaty of Busza (also known as the "Treaty of Jaruga") signed with Iskender Pasha. The treaty stated that Poland would not meddle in the internal affairs of Ottoman vassals in Transylvania, Moldavia, and Wallachia, the Commonwealth was to prevent Cossacks from raiding lands in the Ottoman Empire, while ceding Khotyn. In return, the Turks promised to stop Tatar raids.