ANKARA (Reuters) - Turkish President Tayyip Erdogan on Tuesday congratulated U.S. President-elect Joe Biden and Vice President-elect Kamala Harris on their victory in the 2020 presidential election, after years of rising tension between the NATO allies.Bilateral ties have become strained over a host of issues, including Turkey’s purchase of Russian S-400 missile defence systems, differences in policy on Syria and the detention of U.S. consulate employees and citizens in Turkey. But the personal rapport between Erdogan and President Donald Trump have kept relations from deteriorating further. In his message on Tuesday, Erdogan reiterated Ankara’s “determination to work closely with the U.S. administration” in the coming period. He said “the strong cooperation and alliance” between the two countries would continue to contribute to world peace.