The crisis in Ukraine has the possibility of destabilising the world. Having said that it's unlikely the UN, European Union or America have enough will to get involved and help Ukraine. That, too, is a dangerous option. Putin is still an old fashioned Communist at heart. He senses weakness, will press his advantage and take over the strategically important Crimea. It's a slippery slope when people do nothing and stand by while democracy is threatened.
Blow by blow coverage of the emerging crisis is well covered on the Daily Telegraph link