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Evidence continues to emerge that ballistic missile development ties between North ­Korea and Iran are active and producing improvements in the arsenals of both countries.

While Iran has been the junior partner in the relationship in the past—acquiring No Dong and other missile technologies to build its own systems—a reverse flow of technical know-how is now underway.

The first public appearance in North Korea of the BM25 Musudan, for instance, is a weapon that Israeli officials say has already been delivered to Iran. It is the first time the road-mobile, liquid-fueled intermediate-range ballistic ­missile has been shown beyond the North Korean military. The public unveiling took place on Oct. 10 during a parade attended by the country’s leader, Kim Jung Il, and leader-designate, Kim Jung Un.