Commentators have rushed to declare the long-criticized policy of NATO expansion as irrelevant to the war’s outbreak, or as a mere fig leaf used by Russian President Vladimir Putin to mask what former Secretary of State Condoleezza Rice and former Defense Secretary Robert Gates recently called “his messianic mission” to “reestablish the Russian Empire,” in a Washington Post opinion piece. Fiona Hill, a presidential adviser to two Republican administrations, has deemed these views merely the product of a “Russian information war and psychological operation,” resulting in “masses of the U.S. public… blaming NATO, or blaming the U.S. for this outcome.”

Yet a review of the public record and dozens of diplomatic cables made publicly available via WikiLeaks show that U.S. officials were aware, or were directly told over the span of years that expanding NATO was viewed by Russian officials well beyond Putin as a major threat and provocation; that expanding it to Ukraine was a particularly bright red line for Moscow; that such action would inflame and empower hawkish, nationalist parts of the Russian political spectrum; and that it could ultimately lead to war.

In a particularly prophetic set of warnings, U.S. officials were told that pushing for Ukrainian membership in NATO would not only increase the chance of Russian meddling in the country but also risked destabilizing the divided nation—and that the United States and other NATO officials pressured Ukrainian leaders to reshape this unfriendly public opinion in response. All of this was told to U.S. officials in both public and private by not just senior Russian officials going all the way up to the presidency, but by NATO allies, various analysts and experts, liberal Russian voices critical of Putin, and even, sometimes, U.S. diplomats themselves.