This could trigger a significant sell off around the world. If you are an aggressive investor, consider to add short exposure.
Some of my models show this could be the trigger to a 5% repricing on US Equities.
This is likely to increase protectionist policies coming out of the White House. These policies are likely to create stress on other governments like China, the European Union and Mexico.
Bloomberg:
https://www.bloomberg.com/news/articles/2018-03-06/japan-stocks-to-rally-on-possible-korea-talks-markets-wrap