Question: When did the chemical attacks happen in 2017 in the country known for its Muslims and the people who traded slaves into the Middle East?

<P0-S0> Previously slaves had been traded by Arabs north to the northern part of Africa and into the Middle East. <P0-S1> Guinea-Bissau was once part of the kingdom of Gabu, part of the Mali Empire; parts of this kingdom persisted until the 18th century. <P0-S2> Other parts of the territory in the current country were considered by the Portuguese as part of their empire. <P0-S3> Portuguese Guinea was known as the Slave Coast, as it was a major area for the exportation of African slaves by Europeans to the western hemisphere. <SEP> <P1-S0> russia entered the cwc with the largest declared stockpile of chemical weapons. <P1-S1> by 2010 the country had destroyed 18,241 tonnes at destruction facilities located in gorny (saratov oblast) and kambarka (udmurt republic), where operations have finished, and shchuchye (kurgan oblast), maradykovsky (kirov oblast), leonidovka (penza oblast) while installations are under construction in pochep (bryansk oblast) and kizner (udmurt republic). <P1-S2> by 2016, russia destroyed around 94% of its chemical weapons, planning to completely destroy its remaining stockpile by the end of 2018. on september 27, 2017 russia announced the destruction of the last batch of chemical weapons, completing the total destruction of its chemical arsenal, ahead of schedule.on march 4, 2018, russia was alleged to have conducted a chemical attack in salisbury, uk that left 5 injured including the alleged target of the attack, sergei skripal. <SEP> <P2-S0> At the time of the attack, the town was under the control of Tahrir al - Sham, previously known as the al - Nusra Front. <P2-S1> The Khan Shaykhun chemical attack took place on 4 April 2017 on the town of Khan Shaykhun in the Idlib Governorate of Syria. <SEP> <P3-S0> Most Kurds (8.5%) and most Turkoman (3%) are Sunni and account for the difference between Sunnis and Sunni Arabs, while 13% of Syrians are Shia Muslims (particularly Alawite, Twelvers, and Ismailis but there are also Arabs, Kurds and Turkoman), 10% Christian (the majority are Antiochian Greek Orthodox, the rest are Syrian Orthodox, Greek Catholic and other Catholic Rites, Assyrian Church of the East, Armenian Orthodox, Protestants and other denominations), and 3% Druze. <P3-S1> Sunni Muslims make up between 69–74% of Syria's population and Sunni Arabs account for 59–60% of the population. <P3-S2> Druze number around 500,000, and concentrate mainly in the southern area of Jabal al-Druze.President Bashar al-Assad's family is Alawite and Alawites dominate the government of Syria and hold key military positions. <P3-S3> In May 2013, SOHR stated that out of 94,000 killed during the Syrian Civil War, at least 41,000 were Alawites.Christians (2.5 million), a sizable number of whom are found among Syria's population of Palestinian refugees, are divided into several sects: Chalcedonian Antiochian Orthodox make up 45.7% of the Christian population; the Catholics (Melkite, Armenian Catholic, Syriac Catholic, Maronite, Chaldean Catholic and Latin) make up 16.2%; the Armenian Apostolic Church 10.9%, the Syriac Orthodox make up 22.4%; Assyrian Church of the East and several smaller Christian denominations account for the remainder. <P3-S4> Many Christian monasteries also exist. <P3-S5> Many Christian Syrians belong to a high socio-economic class. <SEP> <P4-S0> the atlantic slave trade or transatlantic slave trade involved the transportation by slave traders of enslaved african people, mainly from africa to the americas, and then their sale there. <P4-S1> the slave trade used mainly the triangular trade route and its middle passage, and existed from the 16th to the 19th centuries. <P4-S2> the vast majority of those who were enslaved and transported in the transatlantic slave trade were africans from central and western africa, who had been sold by other west africans to western european slave traders (with a small number being captured directly by the slave traders in coastal raids), who brought them to the americas. <P4-S3> the south atlantic and caribbean economies especially were dependent on the supply of secure labour for the production of commodity crops, making goods and clothing to sell in europe. <P4-S4> this was crucial to those western european countries which, in the late 17th and 18th centuries, were vying with each other to create overseas empires.