Turkey's prime minister, Recep Tayyip Erdogan, was expected to come to the White House on Thursday for a meeting with President Barack Obama. Erdogan's visit has now been postponed, and the decision to postpone comes on the heels of the Turkish leader's high-profile visit to Iran this week.

When Erdogan does come to Washington, Obama would do well to listen to his Turkish visitor about the current state of play in the strategically vital Middle East. Erdogan will come to Washington not only at a time of strong domestic support for his government and the ruling Justice and Development Party, a moderate Islamist party that has dominated Turkish electoral politics in this decade, but also at a time of increasing influence for Turkey in the broader Middle East -- while America's influence in the region continues to decline.

We spent several days in Turkey last week, where we heard Erdogan describe his country's "zero problems" policy vis-à-vis its neighbors. Regarding the Middle East more specifically, Erdogan's chief foreign policy adviser explained to us that Turkey's approach to the region is based on four principles: Engage all actors; respect the results of all democratic elections (including those in the Palestinian territories in 2006 and Iran in 2009); increase cultural and economic relations among countries in the region; and work with regional and international organizations to maximize possibilities for engagement.

Turkey is, of course, a member of NATO and has long had a positive economic and strategic relationship with Israel. But, working from these four principles, the Erdogan government has in recent years effected major improvements in Turkey's relations with a much wider range of Middle Eastern states, including Iran, Iraq and Syria.

This opening to the broader Middle East has been very strongly in Turkey's interest. Expanding trade and investment links to Iran, Iraq, Syria and other regional states has boosted the growth of Turkey's economy and reinforced its status as an "emerging market" of international significance. Moreover, closer ties to Middle Eastern countries, along with links to Hamas and Hezbollah, have made Ankara an increasingly important player across a wide spectrum of regional issues.

Erdogan wants to position Turkey to act as a mediator between its Muslim neighbors and the West - including the United States, which needs to move beyond nice speeches by Obama and undertake concrete diplomatic initiatives to repair its standing in the Middle East. But if Washington is too shortsighted to see the necessity of realigning its relations with key Middle Eastern actors such as Iran, the Erdogan government's opening to the broader Middle East gives Ankara a wider array of strategic options for pursuing Turkish interests -- the essence of successful diplomacy.

During his visit to Tehran this week, Erdogan met with Supreme Leader Ali Khamenei -- a rare honor for a foreign leader. (In 2007, Russia's then-President Vladimir Putin was also accorded a meeting with Khamenei.) Turkey's expanding ties to the Islamic republic -- including gas supply contracts and preliminary agreements for major upstream and pipeline investment projects -- are essential to consolidating Turkey's role as the leading transit "hub" for oil and gas supplies to Europe. While in Iran, Erdogan said that he hopes Turkish-Iranian trade -- currently valued at roughly $10 billion -- will double by 2011 and strongly supported Iranian participation in the Nabucco gas pipeline. Meeting with Iranian President Mahmoud Ahmadinejad, Erdogan criticized international pressure on Tehran over its nuclear activities as "unjust and unfair" while other states maintain nuclear weapons.

These statements signal that Turkey may well move ahead and conclude significant upstream and pipeline contracts in Iran despite U.S. opposition. The U.S. position on this issue is detached from economic reality. However much the Obama administration resists admitting it, the Nabucco pipeline will almost certainly not be commercially viable in the long run without Iranian gas volumes. In the end, Turkey's approach to Iran does more for Western interests than does the U.S. approach. Under the Erdogan government, Ankara is increasingly confident that it can pursue its interests in the Middle East without either succumbing to U.S. pressure or fundamentally sacrificing its relationship with Washington. Erdogan's planned visit to the White House strongly suggests that this confidence is eminently justified.

Israelis and some of Israel's friends in the United States decry what they see as the expansion of Turkey's ties to other important Middle Eastern states at the expense of Turkey's ties to Israel. Ankara has indeed been sharply critical of Israel's military campaign in Gaza and its role in the continuing humanitarian crisis there -- a posture manifested in Erdogan's highly publicized walkout from a joint event with Israeli President Shimon Peres at the World Economic Forum and the postponement of NATO military exercises in Turkey that would have included Israeli forces. But criticism of Turkey from pro-Israel circles misses an important reality: At this point, Israel arguably needs a relationship with Turkey more than Turkey needs a relationship with Israel.

There is an important lesson here for the Obama administration. America no longer has the economic and political wherewithal to dictate strategic outcomes in the Middle East. Increasingly, if Washington wants to promote and protect U.S. interests in this critical region, it will have to do so through serious diplomacy -- by respecting evolving balances of power and accommodating the legitimate interests of others so that U.S. interests will be respected. Turkey's Middle East policy provides a valuable model of what that kind of diplomacy looks like.