The following year, 1790, Catherine suffered a series of political setbacks. In March, King Frederick William of Prussia, who in 1886 had succeeded his uncle Frederick the Great, surprised Russia and Austria by signing a defensive treaty with Poland, pledging military assistance against foreign interference. On May 3, 1791, the emboldened Polish confederated Diet, knowing that Russia was still enmeshed in war on the Black Sea, and also believing that Poland was now protected by its treaty with Prussia, voted to adopt a new constitution, providing for a hereditary, rather than elective, monarchy. The present ruler, Stanislaus, would be allowed to remain during his lifetime, but on his death, the crown was to become hereditary, passing from father to son in the house of the electors of Saxony. The liberum veto was to be abolished and replaced in the Diet by majority rule. The purpose of the new constitution was to weaken the old nobility and provide Poland with a more effective national government.
Catherine, realizing the extent to which the new constitution diminished the power of the old Polish nobility, on whom she relied to keep Poland weak, was alarmed. The Russian-Polish treaty of 1772 had been unilaterally scrapped. She had no troops available to uphold the old constitution, but, in her anger and frustration, she quickly found allies among the Poles themselves. The conservative Polish nobility, knowing that a weak central government was necessary if they were to keep power in their hands, also rejected the May 3 constitution. These noblemen, meeting in Grodno, formed their own new federation, proclaimed the restoration of the 1772 constitution, and sent a delegation to St. Petersburg to ask Catherine to help them.
Catherine was eager to help. The May 3 constitution was far from radical, but to Catherine there seemed a disturbing similarity between it and the developing attack on the monarchy in France. By July 1791, peace with Turkey was near, and the Russian army would soon be available to support the conservative Poles. She had already told Potemkin, during his last visit to St. Petersburg, that she intended to appoint him commander in chief in this new campaign. There were risks to be considered. Both Leopold of Austria and Frederick William of Prussia, concerned about the deteriorating situation in France, and hoping to calm the increasing turmoil behind their backs in eastern Europe, had agreed to accept Poland’s new May 3 constitution. Frederick William did so as Poland’s new ally; Leopold because he wished to be free to concentrate on France. Both monarchs urged Catherine to join them.
Catherine, who had already decided to act alone if necessary, refused. She tried instead to persuade the Prussians and Austrians to support her approach. She bluntly told her own College of Foreign Affairs in December 1791 that she would never agree to the new Polish political structure, and that she was determined to act. Prussia and Austria “will oppose us with only a pile of written paper,” she predicted. She anticipated protest, but Austria, facing war with France, would do nothing, and if Prussia’s agreement to ignore its treaty with Poland had to be bought with additional Polish territory, she would agree to another partition. As for the Poles themselves, she understood that to restore the 1772 constitution, an invasion by the Russian army would be necessary.
Behind Catherine’s militant new Polish policy was the fact that, despite her talk of a crusade against France, her real worries lay closer to home. She was angered by the steps the Poles had already taken and alarmed by what might follow. An effective, potentially revolutionary regime in Poland would be dangerous to Russia. Was she to ignore this possible threat in order to fight Jacobinism in France? Her duty was to deal with the enemy in the place most threatening to her. She was determined, she told Grimm, to “exterminate that nest of Jacobins in Warsaw.” This was the façade of her argument, but she revealed her real strategy in an outburst to her private secretary on November 14, 1791: “I am breaking my head to push the courts of Vienna and Berlin to involve themselves in the affairs of France. The Austrian court is willing but the court of Berlin refuses to move.… There are reasons which I cannot explain [to them]. I wish to engage them in these affairs in order to have elbow room. I have in mind much unfinished business and it is necessary that they be kept busy so that they cannot hinder me.” Her “unfinished business” was to restore Russian control of Poland.
