I think it's unlikely that Putin is going to invade Ukraine (not impossible, though). The massing of troops on the border was meant to pressure NATO into giving Putin concessions he wants - no expansion of NATO, reduction to 1997 levels, and so on. This is clearly not working. Putin's savvy enough to know when his bluff has been called, and that a protracted occupation of Ukraine is something Russia can't afford.
Boru
Boru
‘But it does me no injury for my neighbour to say there are twenty gods or no gods. It neither picks my pocket nor breaks my leg.’ - Thomas Jefferson