Huh i would have thought it was obvious. Stalin was quite clearly forced to play his hand and cement russian influence in south east asia in the face the threat fo rising chinese influence after maos takeover in 49. Its a good indicator of the political and economic tensions that existed between these two nation states long before the sino-soviet split blew part the illusion of a unified ''communist'' bloc.
Anyways starting thread about the internal quarrels of state capitalist regimes 50 years ago seems a fairly odd first post for a libertarian communist board
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I had asked this question at revleft.com some time ago and never received a suitable answer. Soviet involvement with the DPRK's invasion of the ROK always struck me as completely mismanaged. Not only was Stalin afraid of inciting the United States to declare war on the USSR, but by boycotting the UN Security Council, he basically paved the way for UN invasion.
Since the opening of Soviet archives it has been clearly shown that the USSR was deeply involved with the planning of the Korean War. For example, see this document: Report on Military Situation by Shtykov to Cde. Zakharov. But why did they pick an invasion date that corresponded with a time when the USSR was boycotting the security council due to the bodies non-admittance stance of the newly formed PRC?
Back in January of 1950, the Russian rep to the Security council had walked out for this reason, but we know that Kim Il-sung had been in talks with Stalin over an invasion since 1949 at least. More importantly, the day before this walk-out, Dean Acheson of the U.S. State Department had made a speech stating that Korea was not within the United States "defensive perimeter" and even went so far as to say that any area outside of this perimeter would have to rely on UN intervention. (see for example, this document).
So why would Stalin "OK" an invasion at this time, knowing that the UN most likely would become involved and there be nothing the USSR could do to stop it?