(CNN) -- President Obama has written yet another letter to Iran's Supreme Leader and, by all accounts, his missives remain unrequited. It is not a pretty sight -- the commander-in-chief of the planet's mightiest army, the leader of the world's largest economy -- sitting down at his desk, chin in hand, trying to come up with just the right words to persuade the Ayatollah Ali Khamenei to make nice with America, time and again, even after his letters prompt a combination of silence and scorn. It is good that Iran and the United States are talking. But this is another matter altogether. A letter is not needed to maintain communications. The two countries are already engaged in high-level negotiations, with a make-or-break deadline fast approaching on a nuclear deal.
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President Obama has written another letter to Iran's Supreme Leader
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Frida Ghitis: Obama doesn't seem to be a good negotiator when it comes to nuclear deal
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She says reports suggest West is proposing to give Iran more concessions
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Ghitis: Iran has played an expert game, Obama could use some help
@placeholder's ability to nix any deal he does not like looms constantly over the talks, strengthening Iran's hand.