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Arms importation

Both Republican and Loyalist paramilitaries sought to obtain weapons outside of Northern Ireland in order to achieve their objectives. Irish Republican paramilitaries received the vast majority of external support. Over the years, the Provisional IRA imported arms from external sources such as sympathisers in the Republic of Ireland, Irish diaspora communities within the Anglosphere, mainland Europe, the Palestine Liberation Organization, and Libyan leader Muammar Gaddafi. The Soviet Union and North Korea supplied the Official IRA with 5,000 weapons, and the INLA received considerable arms from overseas as well.

The IRA's primary external support was from the Republic of Ireland, whose safe haven allowed the group to raise legal and illegal funds, organise and train, and manufacture a large number of firearms and explosives with ease and then smuggled them into Northern Ireland and England. The IRA's primary weapon in the Republic was explosives (including gelignite, fertiliser, and ANFO), which were responsible for the vast majority of the bombings in Northern Ireland and England throughout the conflict. While the plastic explosive Semtex donated by Gaddafi was appreciated and infamous in IRA bombing campaigns, they were actually sparsely used. Notable events of IRA bombs of Irish origin included Bloody Friday, the Warrenpoint ambush, the assassination of Lord Mountbatten, and the Hyde Park and Regent's Park bombings.

Loyalist paramilitaries also received support, mainly from Protestant supporters in Canada, England, and Scotland (including members of the Orange Order). From 1979 to 1986, loyalist paramilitaries imported up to 100 machine guns and "as many rifles, grenade launchers, magnum revolvers and hundreds of thousands of rounds of ammunition from Canada." Members of the Grand Orange Lodge of Scotland sent gelignite explosives to UDA and UVF members. British Army's Force Research Unit (FRU) agent Brian Nelson also secured a large amount of weaponry from the South African government to loyalists.