It’s not about multi-tasking. The point I was making was that a lot of neoconservatives seem to care about the integrity of every border and the sovereignty of every nation except that of the US. The same people (John McCain, Bill Kristol) who are all up in arms about Crimea are the ones advocating policies that amount to an annexation of the US southwest by Mexico in everything but name.
Why conflate the two issues? They are separate.
The elites from both US Parties have decided they want open borders. We can disagree and fight them on the issue by electing others.
But this issue has nothing to do and is no reason to ignore the illegal annexation and incursion into Ukraine by Russia. And it is not in US security interests to allow an enemy to steam roll weaker nations without at least economic consequences.