"The essay by MIT political scientist Barry Posen was originally published in the Russian-language journal Ukraine: Issues of Security in 1994, the year the US pledged to assure Ukraine's security, and then republished when the war began in 2022. Posen's goal was to "argue that Ukraine can address most of its plausible threat scenarios, with modest effectiveness, through a military strategy that could be termed a 'strategic defense in depth.'" This meant that Ukrainian mechanized forces would fight a delaying action in eastern Ukraine, while the infantry would construct layers of fortified lines behind the Dnipro River, shielding the western half of the country."

--Michael Peck in Business Insider