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In page Molotov cocktail:

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However, Molotov cocktails are not always improvised in the field. It is not uncommon for them to be mass-produced to a certain standard as part of preparation for combat. Some examples of this being done are the anti-invasion preparations of the British Home Guard during World War II[4] and the Ukrainian volunteer units during the 2022 Russian invasion of Ukraine.[citation needed] During World War II, Molotov cocktails were even factory produced in several countries, such as Finland,[5] Nazi Germany,[6][7] the Soviet Union,[6] Sweden,[8][9] and the United States;[10] some featuring specially designed frangible containers and fuses[6][7] (such as the US Frangible Grenade M1 for example).[10]