...the threat or use of force to violate international
lines of demarcation, such as armistice
lines, established by or pursuant to an international agreement to which it is a party or which it is otherwise bound to respect." Though the war may have been between the Koreas, this does not necessarily mean that the Armistice Agreement (see S/3079, available through UN ODS) only binds those States. Of course China also is a party to it, but more importantly General Clark, Commander-In-Chief of the United Nations Command committed the United Nations...