Looks like this Black-bellied plover is giving the Dunlin flying lessons.
Black-bellied plover - Pluvialis squatarola
Wary and quick to give alarm calls, the Black-bellied Plover functions worldwide as a sentinel for mixed groups of shorebirds.
Dunlin -Calidris alpina
Dunlin breeding in northern Alaska apparently move west, migrating down the eastern side of Siberia and Asia to Japan and China.