There are larger interests that may drive such initiatives. ‘American Interests’ is a broad term that provides a foundation for US involvement in foreign affairs. In Ukraine’s case, Russian influence has infected Ukranian governance.
Taking the high altitude view of Russia vs the US with Europe as the battleground, the protection of Europe still commands the attention of the US.
Personally, I would prefer that all US bases in the EU be decommissioned to allow for the more aggressive opponents of the EU to finish it off. Europeans have demonstrated their willingness to be ruled. Let it be so.
More accurate is Europeans have demonstrated their willingness to live well off taking advantage of the USA. What do we care if Hungry has a contested border dispute with Romania? Why is it up to some kid from West Virginia to be stationed overseas to prevent Romania and Hungry coming to blows?