ANKARA   North Korea has warned that Seoul's ports and military bases are "not safe" after a US submarine docked in South Korea, state media reported on Wednesday. Kim Yo Jong, sister of North Korean leader Kim Jong Un, criticized the arrival of the nuclear-powered USS Vermont submarine to South Korea. "The US strategic assets will never find their resting place in the region of the Korean Peninsula. We will continue to inform that all the ports and military bases of the ROK (Republic of Korea)