Russia escalated its attacks on Mariupol in a push to capture the strategic port city; two Ukrainian refugees enter Poland every three seconds; Russian military vehicles were deployed around 20 miles from Kyiv, according to satellite imagery. Photo: Evgeniy Maloletka/Associated Press 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