The Democrats’ perception of the Ukrainian situation was expressed by multiple witnesses at the impeachment hearings who declared (as Stanford Prof. Pamela S. Karlan put it) it’s “just our national interest to make sure that the Ukraine remains strong and on the front lines so we can fight the Russians there and we don’t have to fight them here.” Article from 2020/07/09
Neoconservatives advocated #NATO expansion to Ukraine even before it became official U.S. policy under President George W. Bush, Jr. in 2008. They saw Ukraine's membership in NATO as the key to U.S. regional and global dominance.