North Korea leader Kim Jong Un, foreground, attends a launching ceremony of what is reportedly a new nuclear attack submarine, named Hero Kim Kun Ok, in the country North Korea on Sept. 6, 2023. (Korean Central News Agency/Korea News Service via AP) 
North Korea leader Kim Jong Un, second left, looks at what is said to be a new nuclear attack submarine. (Korean Central News Agency/Korea News Service via AP) 
The North Korean port of Sinpo is seen Sept. 7, 2023, with a submarine in the lower left-hand corner. (Planet Labs PBC via AP) 
North Korea’s new nuclear attack submarine is named Hero Kim Kun Ok. (Korean Central News Agency/Korea News Service via AP) 
North Korea’s new nuclear attack submarine is named Hero Kim Kun Ok. (Korean Central News Agency/Korea News Service via AP)
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