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Group 1 - The core issue revolves around the interruption of Russian oil supplies through Ukraine, which Hungary and Slovakia blame on Ukraine, leading them to seek alternative routes for oil delivery [1][2] - Hungary and Slovakia have requested Croatia to allow the transport of Russian oil via the Adriatic pipeline, citing a need for energy security amid the supply disruption [2][3] - The "Friendship" pipeline, a major oil transport system from Russia to Central and Eastern Europe, has seen a significant reduction in oil flow, with last year's deliveries dropping to a decade low of 9.7 million tons [3] Group 2 - Hungary's oil and gas company has contacted the government to initiate the release of strategic oil reserves to ensure supply security in the region [2] - The European Commission has confirmed the interruption of the "Friendship" pipeline and is in close contact with Hungary, Slovakia, and Croatia regarding the situation [2] - The geopolitical tensions are evident as Hungary's government expresses skepticism towards EU military aid to Ukraine and opposes Ukraine's EU membership [1][2]