Question: What month did the Tripartite discussions begin between Britain, France, and the country where, despite being headquartered in the nation called the nobilities commonwealth, the top-ranking Warsaw Pact operatives originated?

<P0-S0> prior to the reformation, the polish nobility were mostly either roman catholic or orthodox with a small group of muslims. <P0-S1> many families, however, soon adopted the reformed faiths. <P0-S2> after the counter-reformation, when the roman catholic church regained power in poland, the nobility became almost exclusively catholic, despite the fact that roman catholicism was not the majority religion in commonwealth (the catholic and orthodox churches each accounted for some 40% of all citizens population, with the remaining 20% being jews or members of protestant denominations). <P0-S3> in the 18th century, many followers of jacob frank joined the ranks of jewish-descended polish gentry. <P0-S4> although jewish religion wasn't usually a pretext to block or deprive of noble status, some laws favoured religious conversion from judaism to christianity (see: neophyte) by rewarding it with ennoblement. <SEP> <P1-S0> The Polish nobility enjoyed many rights that were not available to the noble classes of other countries and, typically, each new monarch conceded them further privileges. <P1-S1> Those privileges became the basis of the Golden Liberty in the Polish–Lithuanian Commonwealth. <P1-S2> Despite having a king, Poland was called the nobility's Commonwealth because the king was elected by all interested members of hereditary nobility and Poland was considered to be the property of this class, not of the king or the ruling dynasty. <P1-S3> This state of affairs grew up in part because of the extinction of the male-line descendants of the old royal dynasty (first the Piasts, then the Jagiellons), and the selection by the nobility of the Polish king from among the dynasty's female-line descendants. <SEP> <P2-S0> while the warsaw pact was established as a balance of power or counterweight to nato, there was no direct confrontation between them. <P2-S1> instead, the conflict was fought on an ideological basis. <P2-S2> both nato and the warsaw pact led to the expansion of military forces and their integration into the respective blocs. <P2-S3> the warsaw pact's largest military engagement was warsaw pact invasion of czechoslovakia (with the participation of all pact nations except romania and albania). <P2-S4> the pact failed to function when the revolutions of 1989 spread through eastern europe, beginning with the solidarity movement in poland and its success in june 1989. <SEP> <P3-S0> The Warsaw Treaty's organization was two-fold: the Political Consultative Committee handled political matters, and the Combined Command of Pact Armed Forces controlled the assigned multi-national forces, with headquarters in Warsaw, Poland. <P3-S1> Furthermore, the Supreme Commander of the Unified Armed Forces of the Warsaw Treaty Organization which commands and controls all the military forces of the member countries was also a First Deputy Minister of Defense of the USSR, and the Chief of Combined Staff of the Unified Armed Forces of the Warsaw Treaty Organization was also a First Deputy Chief of the General Staff of the Armed Forces of the USSR. <P3-S2> Therefore, although ostensibly an international collective security alliance, the USSR dominated the Warsaw Treaty armed forces. <SEP> <P4-S0> By the end of May, drafts were formally presented. <P4-S1> In mid-June, the main Tripartite negotiations started. <P4-S2> The discussion was focused on potential guarantees to central and east European countries should a German aggression arise. <P4-S3> The USSR proposed to consider that a political turn towards Germany by the Baltic states would constitute an "indirect aggression" towards the Soviet Union. <P4-S4> Britain opposed such proposals, because they feared the Soviets' proposed language could justify a Soviet intervention in Finland and the Baltic states, or push those countries to seek closer relations with Germany. <P4-S5> The discussion about a definition of "indirect aggression" became one of the sticking points between the parties, and by mid-July, the tripartite political negotiations effectively stalled, while the parties agreed to start negotiations on a military agreement, which the Soviets insisted must be entered into simultaneously with any political agreement.