can claim a share of the blame, but only one, Xiden* was in office during the past 14 months and his regime is responsible for this failure. Putin laid out his objections to U.S. and NATO policy toward Ukraine and the West ignored his concerns.
The West Could Have Prevented The Russo-Ukrainian War, But Chose Not To
https://thefederalist.com/2022/02/25/the-west-could-have-prevented-the-russo-ukrainian-war-but-chose-not-to/