In 1918, a treaty between Germany and Russia led to a crisis for the Allies. In an effort to protect Czech troops in Russia, and to secure northern Russian ports from Germans, the Allies sent a multinational force into North Russia, under British command. US Troops did not stay long, with the last units out by the middle of August 1919.
"Historical Files of the U.S. Expeditionary Force, North Russia, 1918-19" database with images Fold3 (https://www.fold3.com/publication/483/us-expeditionary-force-north-russia: accessed October 2, 2022)
US Expeditionary Force, North Russia
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30 Jul 2007
13 Nov 2007
NARA M924. In 1918 and 1919, U.S. forces participated in security operations in North Russia, near the ports of Murmansk and Archangel.