Treaty of Warsaw (1920)

The Treaty of Warsaw (also the Polish-Ukrainian or Petlura-Piłsudski Alliance or Agreement) of April 1920 was a military-economical alliance between the Second Polish Republic, represented by Józef Piłsudski, and the Ukrainian People's Republic, represented by Symon Petlura, against Bolshevik Russia. The treaty was signed on April 21, 1920, with a military addendum on April 24.

The alliance was signed during the Polish-Soviet War, just before the Polish Kiev Offensive. Piłsudski was looking for allies against the Bolsheviks and hoped to create a Międzymorze alliance; Petlura saw the alliance as the last chance to create independent Ukraine.

The treaty had no permanent impact. The Polish-Soviet War continued and the territories in question were distributed between Russia and Poland in accordance with the 1921 Peace of Riga. Ukrainian territories were split between the Ukrainian SSR in the east and Poland in the west (Galicia and part of Volhynia).

Background
The Polish leader Józef Piłsudski was trying to create a Poland-led alliance of East European countries, the Międzymorze federation, designed to strengthen Poland and her neighbors at the expense of Tsarist Russia, and later of the Russian SFSR and the Soviet Union. His plan was however plagued with setbacks, as some of his planned allies refused to cooperate with Poland, and others, while more sympathetic, proffered to avoid conflict with the Bolsheviks. But in April 1920, from a military standpoint, Polish army needed to strike at the Soviets, to disrupt their plans for an offensive of their own. Piłsudski also wanted an independent Ukraine to be a buffer between Poland and Russia rather than seeing Ukraine again dominated by Russia right at the Polish border. Piłsudski, who argued that "There can be no independent Poland without an independent Ukraine", may have been more interested in Ukraine being split from Russia than he was in Ukrainians' welfare. As such, Piłsudski turned to Petlura, whom he originally had not considered high on his planned allies list.

A Ukrainian delegation could not gain recognition for Ukraine as an independent state at the Treaty of Versailles at the end of the First World War, and the Ukrainian dream of independence was also plagued with setbacks, with Ukrainian lands becoming a warzone between various local and foreign factions vying for their control. The Ukrainian People's Republic, led by Petlura, suffered mounting attacks on its territory since early 1919, and by April 1920 most of Ukrainian territory was outside its control.

In such conditions, Józef Piłsudski had little difficulty in convincing Petlura to join the alliance with Poland despite recent conflict between the two nations that had been settled in favour of Poland the previous year.

The treaty
The treaty was signed on 21 April in Warsaw (it should be noted that some sources give the dates 20 and 22 April for the signing of the treaty). In exchange for agreeing to a border along the Zbruch River, recognizing the recent Polish territorial gains in western Ukraine (Article II) (obtained by the Poland's defeating the Ukrainian attempt to create another Ukrainian state in Volhynia and Galicia, territories with mixed Ukrainian-Polish population), Poland recognized the Ukrainian People's Republic as an independent state (Article I) with borders as defined by Articles II and III and under ataman Petlura's leadership.

A separate provision in the treaty prohibited both sides from concluding any international agreements against each other (Article IV). Ethnic Poles within the Ukrainian border, and ethnic Ukrainians within the Polish border, were guaranteed the same rights within their states (Article V). Unlike their Russian counterparts, whose lands were to be distributed among the peasants, Polish landlords in Ukraine were accorded special treatment until a future legislation would be passed by Ukraine that would clarify the issue of Polish landed property in Ukraine (Article VI). Further, an economic treaty was drafted, significantly tying Polish and Ukrainian economies; Ukraine was to grant significant concessions to the Poles and the Polish state.

The treaty was followed by a formal military alliance signed by general Volodymyr Sinkler and Walery Sławek on April 24. Petlura was promised military help in regaining the control of Bolshevik-occupied territories with Kiev, where he would again assume the authority of the Ukrainian People's Republic. The Ukrainian republic was to subordinate its military to Polish command and provide the joint armies with supplies on Ukrainian territories; the Poles in exchange promised to provide equipment for the Ukrainians.

On the same day as the military alliance was signed (April 24), Poland and UPR forces began the Kiev Operation, aimed at securing the Ukrainian territory for the Petlura's government thus creating a buffer for Poland that would separate it from Russia. Sixty-five thousand Polish and fifteen thousand Ukrainian soldiers took part in the initial expedition. After winning the battle in the south, the Polish General Staff planned a speedy withdrawal of the 3rd Army and strengthening of the northern front in Belarus where Piłsudski expected the main battle with the Red Army to take place. The Polish southern flank was to be held by Polish-allied Ukrainian forces under a friendly government in Ukraine.

Importance
For Piłsudski, this alliance gave his campaign for the Międzymorze federation the legitimacy of joint international effort, secured part of the Polish eastward border, and laid a foundation for a Polish dominated Ukrainian state between Russia and Poland. For Petlura, this was a final chance to preserve the statehood and, at least, the theoretical independence of the Ukrainian heartlands, even while accepting the loss of Western Ukrainian lands to Poland.

Aftermath
Both Piłsudski and Petlura were criticized by other factions within their governments and nations. Piłsudski faced stiff opposition from Dmowski's National Democrats who opposed Ukrainian independence; Petlura, in turn, was criticized by many Ukrainian politicians for entering a pact with the Poles and giving up on Western Ukraine. Mykhailo Hrushevsky, the highly respected chairman of the Central Council, also condemned the alliance with Poland and Petlura's claim to have acted on the behalf of the UPR. In general, many Ukrainians viewed a union with Poles with great suspicion, especially in the view of historically difficult relationships between the nations, and the alliance received an especially dire reception from Galicia Ukrainians who viewed it as their betrayal; their attempted state, the West Ukrainian People's Republic, had been defeated by July 1919 and was now to be incorporated into Poland. The Western Ukrainian political leader, Yevhen Petrushevych, who expressed fierce opposition to the alliance, left for exile in Vienna. The remainder of the Ukrainian Galician Army, the Western Ukrainian state's defence force, still counted 5,000 able fighters though devastated by a typhoid epidemic, joined the Reds on 2 February 1920 as the transformed Red Ukrainian Galician Army. Later, the Galician forces would turn against the Reds and join Petliura's forces when sent against them, resulting in mass arrests and disbandment of the Red Galician Army.

On April 26, in his "Call to the People of Ukraine", Piłsudski assured that "the Polish army would only stay as long as necessary until a legal Ukrainian government took control over its own territory". Despite this, many Ukrainians were just as anti-Polish as anti-Bolshevik, and resented the Polish advance, which many viewed as just a new variety of occupation considering previous defeat in the Polish-Ukrainian War. Thus, Ukrainians also actively fought the Polish invasion in Ukrainian formations of the Red Army. Some scholars stress the effects of Soviet propaganda in encouraging negative Ukrainian sentiment towards the Polish operation and Polish-Ukrainian history in general.

The alliance between Piłsudski and Petliura resulted in 15,000 allied Ukrainian troops supporting Poles at the beginning of the campaign, increasing to 35,000 through recruitment and desertion from the Soviet side during the war. This number, however, was much smaller than expected, and the late alliance with Poland failed to secure Ukraine's independence, as Petlura did not manage to gather any significant forces to help his Polish allies.

On May 7, during the course of the Kiev Offensive, the Pilsudski-Petliura alliance took the city. Anna M. Cienciala writes: "However, the expected Ukrainian uprising against the Soviets did not take place. Ukraine was ravaged by war; also, most of the people were illiterate and had not developed their own national consciousness. Finally, they distrusted the Poles, who had formed a large part of the landowning class in Ukraine up to 1918."

The divisions within the Ukrainian factions themselves, with many opposing Poles just as they opposed the Soviets, further reduced the recruitment to the pro-Polish Petlura forces. In the end, Petlura forces were unable to protect the Polish southern flank and stop the Soviets, as Piłsudski hoped; Poles at that time were falling back before the Soviet counteroffensive and were unable to protect Ukraine from the Soviets by themselves.

The Soviets retook Kiev in June. Petlura's remaining Ukrainian troops were defeated by the Soviets in November 1920, and by that time the Poles and the Soviets had already signed an armistice and were negotiating a peace agreement. After the Polish-Soviet Peace of Riga next year, Ukrainian territory found itself split between the Ukrainian SSR in the east, and Poland in the west (Galicia and part of Volhynia). Piłsudski felt the agreement was a shameless and short-sighted political calculation. Allegedly, having walked out of the room, he told the Ukrainians waiting there for the results of the Riga Conference: "Gentlemen, I deeply apologize to you". Over the coming years, Poland would provide some aid to Petlura's supporters in an attempt to destabilize the Ukrainian SSR (see Prometheism), but it could not change the fact that Polish-Ukrainians relations would continue to steadily worsen over the interwar period. One month before his death Pilsudski told his aide: "My life is lost. I failed to create the free from the Russians Ukraine"