Passage: North Korea occupies the northern portion of the Korean Peninsula, lying between latitudes 37° and 43°N, and longitudes 124° and 131°E. It covers an area of 120,540 square kilometers (46,541 sq mi). North Korea shares land borders with China and Russia to the north, and borders South Korea along the Korean Demilitarized Zone. To its west are the Yellow Sea and Korea Bay, and to its east lies Japan across the Sea of Japan (East Sea of Korea).

Question: What country or countries does North Korea share land boundaries with northward?
China and Russia