(Adds rival rally and comments from opposition leader Peter Magyar from paragraph 8) * Orban speaks on anniversary of 1956 anti-Soviet uprising * Orban has opposed EU policies on aid to Ukraine * New pro-EU opposition party poses threat to his 15-year rule * Opposition rally also attracts tens of thousands By Krisztina Than and Anita Komuves BUDAPEST, Oct 23 (Reuters) – Nationalist Prime Minister Viktor Orban on Thursday accused the European Union of wanting to impose a "puppet" government on Hungary and presented next year's election as a choice between peace or going to war to "die for Ukraine." As tens of thousands of his supporters filled a central square in Budapest, Orban, under threat from a centre-right pro-EU opposition party, said Brussels wanted war and intended to eventually di

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