W.I Napoleon goes to St Petersburg instead of Moscow?

How would the 1812 campaign be if Napoleon marches to St Peterburg any chance it would be succesfull?
Perhaps would that bring Sweden on his side ? Any suggestions?
 
But in this case there would not be an army that goes to Moscow perhaps an army to protect his right wing but not with the intention to march to Moscow?
The Grande Armee's goal would be St Petersburg
 
But in this case there would not be an army that goes to Moscow perhaps an army to protect his right wing but not with the intention to march to Moscow?
The Grande Armee's goal would be St Petersburg

But the distances involved are similar, so he probably suffers about the same (horrendous) number of casualties as he did getting to Moscow. Assuming that Alexander and his officials flee to Moscow, by the time he has taken StP Napoleon has too few troops left to follow, but is just sitting in a (probably burnt out) city and no nearer winning the war than he was OTL.
 
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