Laurence Rees on Stalin
Regarding the 1941 'dacha' episode, Laurence Rees (in his book
The Nazis, A Warning From History, 2005 paperback edition, p.174-175) says:
...Back in Moscow, Stalin was coaxed out of his dacha at the end of June after two days, when a delegation from the Politburo 'convinced' him to lead the Soviet Union to victory. (At least one historian believes that Stalin, in retreating to his dacha, was following a ruse of Ivan the Terrible's - feigning collapse to see who supported him and who didn't.) In any event, there was no alternative leader of the Soviet Union. Stalin had helped get them into this disastrous situation - now he would have to help them get out of it.
On 3 July Stalin finally made a radio broadcast to the Soviet people and spoke about the German invasion...
So there's at least one historian out there on record that Stalin wasn't in seclusion in the dacha for anything like thirteen days, and a suggestion at that point that Stalin may have been pulling his game back together sufficiently for the whole dacha withdrawal to be a 'ruse' to see how those around him reacted.
To be honest, from what I've read about the original timeline Stalin, he doesn't seem to me to be the sort to kill himself in June 1941 - the Germans are still hundreds of miles from Moscow, and the Soviet history books have examples like Napoleon Bonaparte of people who've tried to invade Russia before and ended up dramatically failing. Yes, the situation looks bad, has been a sudden very nasty shock, and is embarrassing, but it's a long way short of catastrophic. I just don't see original timeline Stalin as a 'quitter' and 'giving up' to the extent of killing himself at this stage.
And if this isn't the original timeline Stalin, then how has he been managing to run the Soviet Union for years if he's the sort who bumps himself off when the Germans are still such a long way from absolute victory? To my mind that would only likely work if Stalin's been a figurehead for someone else behind the 'throne', who - if Stalin shoots himself - will either take over themself, or appoint another man 'up front'...
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For the record, Laurence Rees dates Stalin as retreating back to his dacha on 27th June, 1941, after a meeting at 'the Commissariat of Defence on Frunze Street'. (
The Nazis, A Warning from History, 2005 paperback edition, p. 171 & 172.)