The problem here is that Putin's logic and yours might be very different. Russia has already taken the Crimea. If it already has "more land and resources than it know what to do with", then why take the Crimea?
Though a lot of it is to do with control. Putin is happy to have Belarus with a dictator who knows who to bow down to, so Belarus gets left alone. Ukraine started leaning towards the west, but did so too slowly because it was too poor, unlike Estonia, Latvia and Lithuania.
Whatever you think NATO is, it's more or less the thing that binds the US and its allies together. Without the US there is no NATO. The US is corrupt, a war monger. Russia does not want the Ukraine becoming a US ally.
I didn't say Russia took anything in Georgia. And the Georgians went in to South Ossetia because the South Ossetian were bombarding Georgia.
News and Press Release in English on Georgia; published on 2 Aug 2008 by Reuters
reliefweb.int
"The commander of Georgia's peacekeeping force in the region, Mamuka Kurashvili, was quoted by Interfax news agency as saying South Ossetian peacekeepers shot at a Georgian village and suspected Russian peacekeepers of taking part."
Georgia denies the presence of snipers and starting the exchange of fire.
www.aljazeera.com
"
Shota Utiashvili, the Georgian interior ministry spokesman, denied that Georgian positions had fired first.
“The Ossetians opened fire, including with grenade launchers, and the Georgian side only returned fire.”"
Obviously it's difficult to know who did what. I've posted Georgians speaking about it.
HOWEVER, looking at what Russia does, Russia creates conflicts for its own gains. It uses these for its own purposes.