More important, while the conflict is a terrible humanitarian tragedy, it involves no substantial U.S. security interests. Ukraine has never mattered militarily to America. It was part of the Soviet Union for the entire Cold War, and part of the Russian Empire before that. Ukraine's status is no more important for America today. While it matters more for the Europeans, that should be their responsibility, not Washington's.
(Note: You can view every article as one long page if you sign up as an Advocate Member, or higher).