In this Feb. 22, 2017, file photo, a large crowd representing a majority of the remaining Dakota Access Pipeline protesters march out of the Oceti Sakowin camp before the 2 p.m. local time deadline set for evacuation of the camp mandated by the U.S. Army Corps of Engineers near Cannon Ball, N.D. (Mike McCleary/The Bismarck Tribune via AP, File)
FILE - This Aug. 30, 2011, file photo provided by the U.S. Army Corps of Engineers shows Big Diomede Island in Russia, right background, as seen from Little Diomede Island in the U.S. state of Alaska, left foreground. Residents from the tiny Alaska Native village on Little Diomede are trying to reconnect with their long-lost relatives from Big Diomede, who were moved to Russia’s Chukotka Peninsula after the island became a Russian military base during World War II. Three miles separates the islands, but it might as well be thousands of miles because Big Diomede is strictly off-limits. (George A. Kalli/U.S. Army Corps of Engineers via AP, File)