Could Peter III lead Russia-Sweden?

This would be big problem for Swedes. Him should be Lutheran and then Russians wouldn't accept that. And historically relationship between Russians and Swedes haven't been very good. I don't this being possible without war. And Denmark hardly would be happy that Russia would expand to its border.
 
Swedish Nobles would suddenly have a very good reason to go to Copenhagen looking for support to kick him off the throne ... Denmark would love getting rid of him if at all possible, and France would likely be willing to throw cash into such an adventure as well after miracle of Brandenburg
 
Is it possible for Peter III to King of Sweden and Tsar of Russia?

I was going to ask a variation of this question but as long as you started this. What if Peter's father (Charles Frederick of Holstein-Gottorp, Charles XII's only nephew) had gotten the throne of Sweden before his death (doesn't matter how) and become Charles XIII, making OTL Peter III, Charles XIV of Sweden - what happens in Russia?

Obviously Empress Elizabeth can't import her nephew and raise him as the Romanov heir and the only other Romanovs living (that we know of) were the jailed child Tsar Ivan VI and his sibling who Elizabeth had dethroned. If Peter III becomes Charles XIV does Elizabeth still seize the throne? And then what?

Also - he probably doesn't marry Sophie of Anhalt-Zerbst and there is no Catherine the Great in Russia.
 
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