John further initiated peace talks with Denmark and Lübeck to end the Scandinavian Seven Years' War, but rejected the resultingTreaties of Roskilde (1568) where his envoys had accepted far-reaching Danish demands. After two more years of fighting, this war was concluded without many Swedish concessions in the Treaty of Stettin (1570). During the following years he defeated Russia in the Livonian War, and regained Narva by the Treaty of Plussa in 1583. His foreign policy was affected by his connection to Poland; his son Sigismund III Vasa was made king of Poland in 1587.