Emotionally, I want to no-fly/no-go zone to the point where my USAF and the USN and its NATO allies are knocking the shit out of the Moscow invaders.
Rationally, its beyond what we should be doing at this point.
I think a series of red lines that are clearly elaborated should be discussed among the American people though.
NATO territory is sacrosanct and any attack on it or members will result in a vigorous and violent response. [fairly easy. already policy]
use of WMDs will result in...[what are you willing to support?]
attacks on NATO member cyber networks
economic support for Russia from non-NATO members