The year 2019 is full of uncertainty.

The U.S.-China trade war started by U.S. President Donald Trump seems to be accelerating with no signs of abating. Whether Trump will meet North Korean leader Kim Jong Un for a second time remains to be seen. How Brexit will turn out and how populist sentiments across Europe will play out in the European Union's parliamentary election in May will set the future course of the EU. Tensions between Japan and South Korea and efforts to solve the decades-old territorial issues between Japan and Russia are holding the attention of foreign policy experts.

In many ways, major policy issues that were left unsolved in 2018 may have to be carried by world leaders to 2019. Some experts say the World Economic Forum's annual meeting in Davos, Switzerland, that begins Jan. 22, will be the first good opportunity for those issues to be discussed among the world's top political and business leaders.