“Russo-Swedish War. In 1788, the head tailor at the Royal Swedish Opera received an order to sew a number of Russian military uniforms. These were then used by the Swedes to stage an attack on Puumala, a Swedish outpost on the Russo-Swedish border, on 27 June 1788. This caused an outrage in Stockholm and impressed the Riksdag of the Estates, the Swedish national assembly, who until then had refused to agree to an offensive war against Russia. The Puumala incident allowed King Gustav III of Sweden, who lacked the constitutional authority to initiate unprovoked hostilities without the Estates' consent, to launch the Russo-Swedish War (1788–1790).[16]”**
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A false flag operation is an act committed with the intent of disguising the actual source of responsibility and pinning blame on a second party. The term is popular amongst conspiracy
theory promoters [analysts] in referring to covert operations of various governments and cabals.[1] ... The term today extends to include countries that organize attacks on themselves and make the attacks appear to be by enemy nations or terrorists, thus giving the nation that was supposedly attacked a pretext for domestic repression and foreign military aggression.[7] ...
https://en.wikipedia.org/wiki/False_flag
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https://en.wikipedia.org/wiki/False_flag (Heading: As Pretexts for War)