Russian Troop Movements and Tensions Along the Ukrainian Border [Updated December 6, 2021] [open pdf - 834KB]
From the Document: "Starting in mid-October 2021 [hyperlink], social media and news outlets [hyperlink] have reported [hyperlink] significant movement by Russian military forces, with limited Russian transparency [hyperlink], on or near the Ukrainian border. These movements, which follow a similar military buildup in March-April 2021 and Russia's Zapad military exercises [hyperlink] in September 2021, come amid increasingly aggressive rhetoric [hyperlink] reported from Russian policymakers about the so-called encroachment of NATO near Russia's borders and the geopolitical status of Ukraine [hyperlink]. Many observers, including some in Congress, have expressed concerns that such buildups and exercises could be the prelude to a second Russian invasion of Ukraine or other aggressive actions."
CRS Insight, IN11806
Congressional Research Service: https://crsreports.congress.gov/