Compare how Putin brought about the secession and annexation of Crimea, without bloodshed but with popular approval, with how Sam Houston and friends brought about the secession of Texas from Mexico, and its annexation by the United States in 1845.
When the Mexicans tried to retrieve a disputed piece of their lost Texas territory, James K. Polk accused them of shedding American blood on American soil, had Congress declare war, sent Gen. Winfield Scott and a U.S. army to Mexico City, and annexed the entire northern half of Mexico, which is now the American Southwest and California.
Compared to the Jacksonian, James Polk, Vladimir Putin is Pierre Trudeau.