Houthi rebels in Yemen have made their largest gains in years since last month, capturing strategic islands along the Red Sea that allow them to threaten global shipping and carrying out a deadly attack on Saudi Arabia’s main airport over the weekend.

This offensive has been powered by weapons assembled in Yemen or derived by Iranian technology, but the Houthis also have a history of using North Korean missiles captured from the Yemeni government in the past, raising the possibility that DPRK weapons could once again feature in the conflict.

While there is no evidence of North Korean support for