North Korea has already launched more than six missile tests since the start of the new year.

Why is North Korea is suddenly launching so many new missile tests -- and what can be done about? Three experts weigh in:

Jeffrey Lewis is a Professor at the Middlebury Institute of International Studies at Monterrey and an open source researcher at the James Martin Center for non proliferation studies

Ankit Panda is a senior fellow at the Carnegie Endowment for International Peace

Michelle Kae is the Deputy Director of the 38 North Program at the Stimson Center