e=Even the Moscow phone book was a classified document.

From The Coldest Winter by David Halberstam.  Page 92.  

When the Truman administration’s top officials convened on June 25 to try to figure out what the invasion meant, other than one half of Korea attacking the other half, they were essentially peering into the dark. These were days when everything the Soviet Union did was clouded in the utmost secrecy, when even the Moscow phone book was a classified document. The immediate belief of the people then gathering around the president in Washington was that the invasion was a direct Moscow move, ordered by Stalin and obeyed by his proxies in North Korea. That would turn out not to be true; years later it became clear from the opening of archives in Moscow that the driving force for the invasion was the young and overconfident Kim Il Sung, and that the ever cautious Stalin had somewhat reluctantly gone along with it. At that moment, the administration’s Soviet experts considered North Korea simply a Soviet satellite, totally under the Kremlin’s thumb, which it largely was, but in this case Stalin was more the accommodator than the instigator. The primary question that concerned Washington at first was: Could the invasion be only a feint, the first move in a larger Russian plan of aggression? And if so, what would Stalin’s next move be? Was Stalin secretly eyeing Europe or a target in the Middle East? Acheson thought the invasion was a feint to be followed up by a Soviet-supported Chinese strike at Chiang on Taiwan or, perhaps equally dangerous, a Communist counterstrike after a provocation by Chiang.

Truman, by contrast, thought the next move might come in Iran. So did Douglas MacArthur, with whom he rarely agreed on anything. On June 26, Truman, in the company of a few close staffers, walked over to a globe, spun it to the Middle East, and pointed to Iran. “Here is where they will start trouble if we aren’t careful. Korea is the Greece of the Far East. If we are tough enough now, if we stand up to them like we did in Greece three years ago, they won’t take any next steps. But if we just stand by, they’ll move into Iran and they’ll take over the whole Middle East. There’s no telling what they’ll do if we don’t put up a fight now.