Fact: China's economy was 50 times greater than VN in 2012.
Fact: We don't need to land on the moon to drop something fun on VN. Should anything happened, Hanoi is only 2 hours drive from the boarder.
China's GDP in 2011 was 7.3 Trillion USD (GDP per capita $5500). By 2020 the GDP per capita of China will be more than likely higher than $11000 which is roughly Turkey's GDP per capita today.
You are talking about the "collapse" of an economy that is 20 times greater than yours. No one knows...
I doubt you can find any 'official links' from the official websites. But it is well known that the more than 8 regiments of AF and NAF have introduced J10A/S. If the production of J10A/B/S keeps at the same pace, there will be around 600 J10 by the end of 2017.
Dead or not it's something up in the orbit. The South K. can do nothing but bugging the Russians for help.
P.S. Maybe also dig up the seabed to get some leftovers of the North Korea's rocket to see if they can reverse-engineer it.