NICOSIA — Poland's prime minister says Turkey must not threaten or try to undermine Cyprus' European Union presidency once the divided island assumes the bloc's helm in July.

Donald Tusk said here on Wednesday that any attempt to weaken Cyprus' EU presidency would be perceived as a bid to weaken the bloc itself.

Cyprus was split in 1974 when Turkey invaded after a coup by supporters of union with Greece. Ongoing talks to reunify the island's breakaway Turkish Cypriot north and internationally recognized Greek Cypriot south have made little tangible progress.

Turkey, an EU membership candidate, doesn't recognize Cyprus and has threatened to freeze its relations with the bloc if the island takes over the presidency before a reunification accord is reached.