Han's visit is set to continue on Thursday and is organized at the French initiative.
Tensions over North Korea's nuclear and ballistic missile programs escalated after Pyongyang said on January 6 that it had successfully carried out a hydrogen bomb test and put a satellite into orbit on February 7. The moves violated UN Security Council resolutions, and prompted the United Nations as well as the United States to impose sanctions.
Last month, Pyongyang urged Seoul to accept its offer to hold military talks and called for joint steps to carry out measures for national unity, citing the need to ease tensions on the Korean peninsula. South Korea rejected the proposal, demanding "a real turn" toward denuclearization.
South and North Korea are still formally at war, as no peace treaty was ever signed after the Korean War of 1950-1953.