Donald Trump decided to go for the final aspect with North Korea. Trump already proposed the world nations to stop importing North Korean goods which would put a loss of few billions of dollars to the North Korean government. Adding to this, Trump requested the world countries to stop exporting fuel and other commodities to North Korea. If this continues, North Korea may starve out of resources and will be forced to accept defeat.
On the other hand, as all the links are being cut, North Korea may take a decision of going for war way in advance than the expected time. Trump and USA is said to be completely ready for the war and hence USA is requesting the help of all the world nations in this aspect. In between, the North Korean people were losing their livelihood and food. Looks like, North Korea may turn into another Syria.