In 1604, the Estates finally recognized the regent and de facto ruler as King Charles IX. His short reign was one of uninterrupted warfare. The hostility of Poland and the breakup of Russia involved him in overseas contests for the possession of Livonia and Ingria, the Polish–Swedish War (1600–1611) and the Ingrian War, while his pretensions to claim Lapland brought on a war with Denmark (Kalmar War) in the last year of his reign.