What person ordered caution at the Sino - Korean border ?
On 27 September , MacArthur received the top secret National Security Council Memorandum 81/1 from Truman reminding him that operations north of the 38th parallel were authorized only if " at the time of such operation there was no entry into North Korea by major Soviet or Chinese Communist forces , no announcements of intended entry , nor a threat to counter our operations militarily ... " On 29 September MacArthur restored the government of the Republic of Korea under Syngman Rhee .