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Group 1 - The recent attack on the "Friendship" oil pipeline by Ukraine has provoked strong reactions from Eastern European countries like Hungary and Poland, directly impacting their energy interests and exacerbating diplomatic tensions with Ukraine [2][6][25] - Hungary and Poland have expressed strong dissatisfaction with Ukraine's actions, warning that Ukraine's EU accession plans may be hindered as a result [3][11][26] - The attack on the pipeline, which carries significant amounts of Russian crude oil through several Central and Eastern European countries, has intensified existing diplomatic conflicts between Ukraine and Hungary [6][8] Group 2 - Hungary's government has condemned Ukraine's actions, stating that they severely affect energy supply and threaten Hungary's national security and economic interests [8][15] - Hungary's foreign minister has indicated that Ukraine's actions will lead to long-term consequences for bilateral relations, particularly regarding Ukraine's EU membership application [13][15] - Poland has joined Hungary in pressuring Ukraine, demanding that it acknowledge historical grievances related to the "Volhynia Massacre" and apologize, which complicates Ukraine's EU accession process [17][19] Group 3 - Poland's government has made it clear that Ukraine must take a definitive stance on historical issues to gain Poland's support for its EU aspirations, threatening strong opposition if these issues remain unresolved [19][28] - The Polish president has proposed banning the use of "Bandera symbols," reflecting concerns over Ukraine's nationalist sentiments and historical issues [21][23] - The combined opposition from Hungary and Poland has made Ukraine's path to EU membership increasingly uncertain, especially as support from Western allies wanes [26][28][30]