abstract
| - The Polish-Lithuanian and Prussian alliance was a mutual defense alliance signed on 29 March 1790 in Warsaw between representatives of the Polish-Lithuanian Commonwealth and the Kingdom of Prussia. It was signed in the brief period when Prussia was seeking an ally against either Austria or Russia, and the Commonwealth was seeking guarantees that it would be able to carry out significant governmental reforms without foreign intervention. From the beginning, the alliance was much more valuable to the Commonwealth than to Prussia. Soon after the treaty was signed, the international situation, and changes within the Commonwealth, made the treaty much less valuable to the Prussian side. Meanwhile, the Commonwealth embarked on a series of major internal reforms, seeing the alliance as a guarantee that it had the backing of a powerful neighbor in this process - where in fact Prussia felt those reforms were not in its best interest, and felt threatened by them. When Russia invaded the Commonwealth in May 1792, Prussia refused a request to honor the alliance and intervene, arguing that it was not consulted with regard to the 3rd May Constitution, which invalidated the alliance. A few months later, in 1793, Prussia aided Russia in the suppression of the Kościuszko Uprising.
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