A Japanese daily says that North Korea sent 160 nuclear and missile experts to Iran last month.

The Sankei Shimbun cited a knowledgeable source of Korean Peninsula affairs as saying that North Korea sent the experts to Iran four times during May.

Sankei says the large-scale dispatch is unusual. It's viewed as an attempt by the North to sell nuclear and missile-related military technologies to Iran to earn money since Pyongyang is under international sanctions.