In late 1600, a Polish diplomatic mission led by Chancellor Lew Sapieha with Eliasz Pielgrzymowski and Stanisław Warszycki arrived in Moscow and proposed an alliance between the Commonwealth and Russia, which would include a future personal union. They proposed that after one monarch's death without heirs, the other would become the ruler of both countries. However, Tsar Godunov declined the union proposal and settled on extending the Treaty of Jam Zapolski, which ended the Lithuanian wars of the 16th century, by 22 years (to 1622).