The interesting place to watch is China. Just look at the graph in this article of National Debt as % of GDP. Totally unsustainable in the long run. (The highest Greece got was 179% of GDP and China does not have the ECB to bail it out and the IMF does not have the resources to act as a lender of last resort even if it wished to)
https://www.ft.com/content/04c67054-b595-11e7-a398-73d59db9e399
How do they avoid a 'bubble' bursting, because if it does the 2008 sub-prime contagion from the States will seem like a walk in the park?
'If no one went no faster than what I do there'd be a sight less trouble in this world'