Of the three kingdoms, Goguryeo was the most militaristic and the largest. At its largest, it contained parts of modern Russia and China. It even controlled several colonies in Japan, which touched off a brief war between the Shogunate and Goguryeo. As a result, the colonies were abandoned, and Goguryeo was weakened.
After the collapse of the dynasty, the royal family fled to Russia, settling near modern Vladivostok. Their descendants would return to the Korean peninsula around the 8th century.