A WSJ investigation reveals Russian troops and military equipment moved out of large visible garrisons in Russia and dispersed into smaller, harder-to-track units along the northeastern border of Ukraine before invasion. Photo illustration: Ryan Trefes WSJ video investigations use visual evidence to reveal the truth behind the most important stories of the day. More from the Wall Street Journal: Visit WSJ.com: http://www.wsj.com/ Visit the WSJ Video Center: https://wsj.com/video On Facebook: https://www.facebook.com/pg/wsj/videos/ On Twitter: https://twitter.com/WSJ On Snapchat: https://on.wsj.com/2ratjSM #Russia #Ukraine #WSJ