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Tehran has reacted with anger and threats over Ankara's decision to allow NATO to deploy a radar as part of its antimissile system, Radio Liberty reported.

Iran's supreme leader, Ayatollah Ali Khamenei, has condemned the decision, while senior Iranian military commanders and government officials have warned of consequences.

"This is very serious, this is important for Iran, Iran does not like it," says Iran analyst Jamsid Assadi of France's Burgundy School of Business. "Iran is feeling very much more isolated and in danger. And if for example when I read Iranian press, especially the very conservative ones, they criticize very clearly what's happening."

Ankara's decision is widely seen as a military and diplomatic victory for Washington, confirming Turkey's commitment to its NATO partners, over its Iranian neighbor.

It's a turn away from the trend of the past few years, when Turkey's Islamic-rooted Justice and Development Party (AKP) had prioritized deepening its relations with Tehran as part of its policy of "zero problems" with its neighbors.

Turkish Prime Minister Recep Tayyip Erdogan at one point even described Iranian President Mahmud Ahmadinejad as a good friend of Turkey, and criticized Ankara's Western allies for their tough stance toward Tehran over its nuclear program.

Inherent tensions
But former Turkish diplomat Sinan Ulgen believes the policy of rapprochement has come to an end. "I think we can talk about a new phase. So indeed we are entering a period of more realistic assessment," he says.

Ulgen adds that "obviously the fact that these statements are coming out from Tehran show that there is now an increasing risk of heightened tension between Ankara and Tehran. This is a tension that is inherent in the relationship of Turkey with Iran. It is inherent because of a historical legacy, because of the influence that these countries are trying to have in the region, which pits one against the other."

Those inherent tensions were already becoming visible even before the radar-deployment decision. Ankara is increasingly seeking to challenge Tehran's influence over shared neighbor Iraq. In March, Erdogan made a high-profile visit to Baghdad.

But its the Arab Spring and Turkey's positioning itself as a supporter of democracy and even the secular state as a model for the new regimes that poses the greatest threat to Iranian-Turkish relations, none more so than Ankara's support of the Syrian opposition.

"If there is going to be a regime change in Syria, the whole power balance will change," explains political scientist Nuray Mert of Istanbul University. "Because if Iran loses Syria, they will lose an important base of power in the Middle East. So it will be a major defeat for Iran and within this framework, Turkey sides with the dissidents and supports some sort of regime change. Iran will take it directly against itself."

Adding to Tehran's angst, Ankara is now closely coordinating its Syrian policy with Washington, claims former Turkish diplomat Ulgen. "There have been a number very high-level phones calls, conversations between Turkish leaders and the U.S. leadership," he says. "And now the two sides are really on the same page and Turkish policy [as] regards to Syria does seem to have the full support of the U.S. administration."

But where Ankara does not have Washington's full support is over its continued financial and trade relations with Iran. Despite the cooling of political relations, Turkish-Iranian trade continues to boom. Ankara steadfastly insists on only the minimum required enforcement of UN sanctions, which it opposed last year as a nonpermanent member of the UN Security Council.

"Turkey was the biggest factor helping and assisting the Iranian regime to survive [sanctions]," claims Iran expert Mehrdad Emadi of the British-based consultancy firm Betamatrix. "Actually, Turkey is the key player. Turkey is facilitating