What two countries participated in the war between 1617-1618 in order to take Polish pressure off of Russia?
Polish–Swedish War (1617–18) The Polish–Swedish War (1617–18) was a phase of the longer Polish–Swedish War of 1600 to 1629. It continued the war of 1600–11 and was an attempt by Sweden to take Polish pressure off Russia. The Polish–Lithuanian Commonwealth was then also fighting Tartars and (on the southern front) the Ottoman Empire. Russia and Sweden were at that stage allied, prior to the Ingrian War, part of the Polish–Muscovite Wars. The 1617–18 war's cause was a dispute over Livonia and Estonia, and a dispute between Sigismund III Vasa and Gustavus Adolphus over the Swedish throne.
War against Sigismund The war against Sigismund (Swedish: "Kriget mot Sigismund" ) was a war between Duke Charles, later King Charles IX and Sigismund, King of Sweden and Poland. Lasting from 1598 to 1599, it is also called War of Deposition against Sigismund, since the focus of the conflicts was the attempt to depose the latter from the throne of Sweden. The war eventually resulted in the deposition of Sigismund, with Duke Charles taking over the government and later also acceding to the throne.