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In page Peter III of Russia:

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While historically Peter's planned war against Denmark-Norway was seen as a political failure, recent scholarship has portrayed it as part of a pragmatic plan to secure his Holstein-Gottorp duchy and to expand the common Holstein-Russian power northward and westwards. Peter III believed gaining territory and influence in Denmark and Northern Germany was more useful to Russia than taking East Prussia.[2]: 218–20  Equally, he thought that friendship with Prussia and with Britain, following its triumph in the Seven Years War, could offer more to aid his plans than alliance with either Austria or France.[citation needed]