Well, it affects the US gov in many ways – but you could conciser most of it blow-back. First, Russia's has bases there, so the term invasion is misleading while technically accurate. And Russia's presence in Ukraine interrupts the billions the US spent destabilizing the region. Russia has a near monopoly on energy in the region supplying natural gas to Europe. It flows through the Ukraine.
But there is a kicker; portions of the Ukraine (and surrounding area) are ripe for hydraulic fracking. If the US develops this resource, it breaks Russia's monopoly on energy – however temporary or destructive the fracking plan may be. The key point here is this – to a degree, the Ukraine is Russia. So this is a flash point if one ever existed. Just my current incomplete perspective – hope it helps you keep looking for answers.
Kunstler; March 3; short article
Patrick J. Buchanan; March 4; medium length essay
Renée Parsons Club Orlov; March 5; in depth crono
Ron Paul; March 6