Poles & Cossacks vs. Ottomans

From The Gates of Europe: A History of Ukraine, by Serhii Plokhy (Basic Books, 2017), Kindle pp. 127-131: The Ukrainian Cossacks, who had begun their international career in the 1550s by serving the tsar of Muscovy, Ivan the Terrible, paid an unsolicited visit to Moscow during the first decade of the seventeenth century. Muscovy was then in turmoil because of an economic, dynastic, and political crisis known as the Time of Troubles. It began at the turn of the seventeenth century with a number of devastating famines caused in part by what we today call the Little Ice Age—a period of low temperatures that lasted half a millennium, from about 1350 to 1850, peaking around the beginning of the seventeenth century. The crisis afflicted Muscovy at a most inopportune time, when its Rurikid dynasty had died out and a number of aristocratic clans contested the legitimacy of the new rulers. The dynastic crisis came to an end in 1613 with the election to the Muscovite throne of the first Romanov…