BUDAPEST — Tensions are escalating dramatically in the final stretch of Hungary’s election race as political rivals trade accusations of vote-buying in rural constituencies, illegal wiretapping and interference from Moscow and Kyiv. Polls suggest that Péter Magyar and his opposition center-right Tisza party could end Prime Minister Viktor Orbán’s 16-year rule in the April 12 election, dethroning the EU leader closest to the Kremlin, who has repeatedly blocked EU attempts to support Ukraine. The