Premise: North Korea . To the north and northwest the country is bordered by China and by Russia along the Amnok ( known as the Yalu in China ) and Tumen rivers ; it is bordered to the south by South Korea , with the heavily fortified Korean Demilitarized Zone ( DMZ ) separating the two . South Korea , officially the Republic of Korea ( ROK ; ) , is a sovereign state in East Asia , constituting the southern part of the Korean Peninsula .
Hypothesis: North Korea is separated from South Korea.
Label: ENTAILMENT