Short answers, pulled from the story.
The year 1702 marked a turning point for the Lipovans, a group of Old Believers who fled southward to escape the Russian Orthodox Church's reforms. These religious dissenters formed some of the earliest diaspora communities outside Russia proper.
The White Wave began after the October Revolution of 1917 and continued through the Russian Civil War that ended in 1922. This first wave carried a heavily political character, distinguishing it from earlier religious migrations.
Ukraine hosts approximately 8.3 million ethnic Russians according to its 2001 census data. Ethnic Russians make up nearly 9 million people in Ukraine according to recent demographic estimates.
Breakaway sectarians known as Pryguny arrived in Los Angeles beginning in 1904 to escape Tsarist persecution. They purchased land in the Guadalupe Valley northeast of Ensenada where they established villages that maintained their culture for decades before being abandoned.
Japan hosts around 11,634 ethnic Russians despite ongoing territorial disputes over the Kuril Islands annexed by the Soviet Union in 1945. South Korea contains roughly 70,000 residents including about 36,000 of Korean descent known as Koryo-saram who trace heritage back to the former Soviet Union.