Croatia is set to hold parliamentary elections on Wednesday in a contest overshadowed by a bitter rivalry between President Zoran Milanović, a Social Democrat friendly towards Moscow, and conservative Prime Minister Andrej Plenković. The latest polls put Plenković’s conservative Croatian Democratic Union (HDZ) ahead of the opposition Social Democratic Party of Croatia (SDP). Milanović made a surprise announcement a month before the elections that he would seek the post of prime minister as the head of the SDP. As president, he has made right-wing populist and pro-Kremlin remarks. Croatian vote…