However, the Tsardom was weakened by the long and unsuccessful Livonian War against the coalition of Poland, Lithuania, Sweden, Denmark, and Norway for access to the Baltic coast and sea trade. At the same time, the Tatars of the Crimean Khanate, the only remaining successor to the Golden Horde, continued to raid southern Russia. In an effort to restore the Volga khanates, Crimeans and their Ottoman allies invaded central Russia and were even able to burn down parts of Moscow in 1571. But in the next year the large invading army was thoroughly defeated by the Russians in the Battle of Molodi, forever eliminating the threat of an Ottoman–Crimean expansion into Russia. The slave raids of Crimeans, however, did not cease until the late 17th century though the construction of new fortification lines across Southern Russia, such as the Great Abatis Line, constantly narrowed the area accessible to incursions.