North Korea's economy grew 3.7 percent in 2017, a professor of a think tank in Pyongyang said in brushing aside the view that the country has faced an economic contraction against a backdrop of international sanctions.

Ri Gi Song, a professor of the Institute of Economics at the Academy of Social Sciences, said in a recent interview with Kyodo News that North Korea has achieved economic expansion without depending on other nations.

Ri said gross domestic product totaled $30.70 billion in 2017, up from $29.60 billion in 2016. It is very rare for North Korea to disclose its GDP and also the first time that the country's GDP data in the past two years have been unveiled.