[U.S President Obama addresses journalists during a joint news conference with Greek PM Tsipras in Athens]ATHENS (Reuters) - U.S. President Barack Obama said on Tuesday there was a "window in the next few weeks, months" for the Cyprus problem to be resolved and Greek and Turkish leaders on the ethically-split island were "genuinely interested" in a compromise approach. Obama was speaking after meeting Greek Prime Minister Alexis Tsipras in Athens. (Reporting by Michele Kambas; Editing by Karolina Tagaris)