 However, the Sejm ratified the treaty in a very limited version, where the idea of an independent Ruthenian Principality was completely abandoned.The news of a Cossack-Polish alliance alarmed Moscow and the Ukrainian cossacks opposing Vyhovsky (led by Ivan Bezpaly) to the extent that an expeditionary force was dispatched to Ukraine in the autumn of 1658 headed by Prince Grigory Romodanovsky.Moscow's military commander not only supported the election by Vyhovsky's opponents of a new rival hetman, but started actively to occupy towns held by Vyhovsky's supporters.