SEOUL, South Korea (AP) — U.S. Vice President Kamala Harris is capping her four-day trip to Asia with a stop at the heavily fortified Demilitarized Zone dividing the Korean Peninsula as she tries to demonstrate the U.S. commitment to the security of its Asian allies.

The visit on Thursday comes on the heels of North Korea’s latest missile launches and amid fears that it may conduct a nuclear test. Visiting the DMZ has become something of a ritual for American leaders hoping to show their resolve to stand firm against aggression.

North Korea fired two short-range ballistic missiles on Wednesday, while Harris was in Japan, and had fired one before she left Washington on Sunday. The launches contribute to a record level of missile testing this year.

Before going to the DMZ, Harris met with South Korean President Yoon Suk Yeol at his office in Seoul and praised the alliance between the countries as a “linchpin of security and prosperity.” Yoon, a conservative who took office in May, called her visit “another turning point” in strengthening ties.

Harris and Yoon were expected to discuss the growing North Korean nuclear threats and the U.S. commitments to defend the South. They were also expected to discuss expanding economic and technology partnerships and repairing recently strained ties between Seoul and Tokyo to strengthen their trilateral cooperation with Washington in the region.