Bestuzhev's chance came when Empress
Elizabeth, immediately after her accession (6 December 1741), summoned him back to court and appointed him vice-chancellor. For the next 20 years, during a period of exceptional difficulty, Bestuzhev practically controlled the foreign policy of Russia. At the time, Bestuzhev judged
France the natural enemy of Russia. The interests of the two states in the
Ottoman Empire,
Poland and
Sweden were diametrically opposed, and Bestuzhev considered that Russia needed to fear the intrigues of France in all three countries, all of which bordered Russia. The enemies of France thus necessarily became the friends of Russia, and its friends were conversely viewed as Russia's enemies. Consequently,
Great Britain and
Austria became Russia's "natural" allies, and the aggressive and energetic King
Frederick II of Prussia, then engaged in the
Silesian Wars and allied with France in the
War of the Austrian Succession, presented a danger to be guard. Bestuzhev therefore adopted the policy of bringing about a quadruple alliance of Russia, Austria, Britain and
Saxony, to counteract the Franco-Prussian league. However, he stood on dangerous ground. Empress Elizabeth herself had an aversion to an alliance with Britain and with Austria, whose representatives had striven to prevent her accession. Many of her personal friends, in the pay of France and Prussia, took part in innumerable conspiracies to overthrow Bestuzhev. Despite those hindrances, Bestuzhev, aided by his elder brother, Mikhail, implemented his policy step by step. Russia and Sweden
had commenced hostilities in 1741. On 11 December 1742 Bestuzhev concluded a
defensive alliance between Britain and Russia. He had previously rejected with scorn French proposals to mediate between Russia and Sweden on the basis of a territorial surrender on the part of the former. Bestuzhev conducted the war so vigorously that by the end of 1742, Sweden lay at the mercy of Russia. During the negotiations for the
Treaty of Åbo (January to August 1743) Bestuzhev insisted for Sweden to cede the whole of
Finland to Russia, thus completing the work of Peter the Great. However, the French contrived to get better terms for Sweden by artfully appealing to Empress Elizabeth's fondness for the House of
Holstein. The Swedes, with the encouragement of Elizabeth, accepted
Adolphus Frederick, Duke of Holstein, as their future king, and, in return, received Finland again, with the exception of a small strip of land up to the
Kymmene River. Bestuzhev could not prevent the signing of a Russo-Prussian defensive alliance in March 1743 but deprived it of all political significance by excluding the proposed guarantee of Frederick's conquests from the
First Silesian War. Moreover Bestuzhev's efforts made the standing of the Prussian king, whom he regarded as even more dangerous than France, at the Russian court fell steadily, and the vice-chancellor prepared the way for an alliance with Austria by agreeing on 1 November 1743 to the
Treaty of Breslau of 11 June 1742. The bogus
Lopukhina Conspiracy, however, put in place by the Holstein faction and aided by France and Prussia, persuaded Elizabeth that the Austrian ambassador had intrigued to restore
Ivan VI to the throne and alienated her from Austria for a time. Bestuzhev's ruin appeared certain when, in 1743, a French agent,
Jacques-Joachim Trotti, marquis de la Chétardie, arrived to reinforce his enemies. However, Bestuzhev found a friend in need in
Mikhail Illarionovich Vorontsov, the empress's confidant, who shared his political views. Still, his position remained most delicate, especially when the betrothal between Grand-Duke
Peter and Sophia of Anhalt-Zerbst (later
Catherine II) took place against his will, and
Elizabeth of Holstein, the mother of the bride, arrived to promote Prussian interests. Frederick II, conscious of the instability of his French ally, now keenly wished to contract an offensive alliance with Russia. The first step to realizing that plan required the overthrow of Bestuzhev, "upon whom", Frederick II wrote to his minister Axel von Mardefeld, "the fate of Prussia and my own house depends". However, Bestuzhev succeeded, at last, in convincing the empress of Chétardie's dangerous intrigues, and on 6 June 1744, Chétardie received orders to quit Russia within twenty-four hours. Five weeks later, Bestuzhev became grand chancellor (15 July 1744). Before the end of the year, Elizabeth of Holstein also was expelled from Russia, and Bestuzhev remained supreme. ==Anti-Prussian coalition==