The isolation of the region was increased further by the Treaty of Constantinople in 1700, which provided that there should be no settlements or fortifications on the coast of the Azov Sea to the mouth of the Mius River. Moreover, in 1709, in response to a Cossack alliance with Sweden against Russia, Tsar Peter the Great ordered the destruction of the Zaporozhian central stockade, called the Sich, and their complete expulsion from the area, without allowance for their return. In 1733, however, Russia was preparing for a new military campaign against the Ottoman Empire and thus allowed the return of the Zaporozhians, although the territory officially belonged to Turkey. Under the terms of the Agreement of Lubny of 1734, the Zaporozhians regained all their former lands and, in return, they were forced to serve in the Russian army during wartime. In addition, they were also permitted to build a new stockade on the Dnieper River called New Sich, though the terms prohibited them from erecting fortifications. These terms allowed only for living quarters, in Ukrainian called "kureni".