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Iranian President Hassan Rouhani arrived in Turkey today for an official visit as the two regional powers seek to restore warm ties and bolster business, despite diametrically opposed roles in the Syrian conflict.聽

Business is a priority: Turkey and Iran want to double the value of bilateral trade to $30 billion by 2015, an aspiration that would be helped by any easing of sanctions that have crippled Iran's economy, as a result of a nuclear deal. Mr. Rouhani tweeted that he聽arrived in the Turkish capital Ankara with seven ministers, Iran鈥檚 central bank governor, and 鈥渕ore than 100 Iranian business executives.鈥�

It was all smiles and diplomatic niceties before the cameras, with signing ceremonies of several cooperation agreements. Both sides sought to聽gloss over聽their history of rivalry. The largely Shiite Islamic Republic and mostly Sunni Turkey have聽long聽presented competing models for how to blend aspects of Islam and democracy.

In neighboring Syria, Turkey has been instrumental in supporting rebels bent on toppling President Bashar al-Assad, while聽Iran has done all in its power to bolster Mr. Assad,聽a decades-long ally and conduit for Hezbollah, while losing聽more and more of its Revolutionary Guard officers. Turkey, whose border is a staging point for foreign anti-Assad jihadists crossing into Syria,聽rejected last week's presidential election there; Iran hailed it as a positive stop toward peace.聽

Yet today Turkish President Abdullah Gul called Iran 鈥渁n old, valuable friend鈥� and said Rouhani鈥檚 two-day trip, the first official visit by an Iranian president in 18 years, was a 鈥渢urning point.鈥�

鈥淥ur relations are not just about two countries. They are important for the whole region and the world,鈥� said Mr. Gul.聽

Rouhani said regional instability did not 鈥渇avor anyone,鈥� and that Turkey and Iran coming together would mean 鈥渃onnecting the Indian Ocean to the Atlantic Ocean.鈥� He said both countries are 鈥渞esolved to fight violence, extremism and terrorism.鈥�

The strategic rivalry has been softened by the fact that聽Turkey has served as a key link between sanctions-hit Iran聽and the global economy. Iran already supplies upwards of 30 percent of Turkey鈥檚 natural gas聽needs; major Turkish exports to Iran include machinery, iron and steel products, and electrical devices, according to the Turkish Ministry of Foreign Affairs.

In January Prime Minister Recep Tayyip Erdogan visited Tehran, where he criticized Western and UN sanctions on Iran. The sanctions helped depress bilateral trade between the two neighbors to $15 billion last year, down from $22 billion in 2012.聽

Ankara has been accused in recent months of trying to help Iran evade sanctions with gold transfers and deals worth billions, which Turkish officials dismiss as part of a conspiracy to tarnish its reputation. Both countries want to bring diplomatic relations back to their May 2010 level, when Turkey and Brazil 鈥� both trusted by Iran at the time 鈥� brokered a nuclear fuel-swap in Tehran, under which more than half of Iran鈥檚 enriched uranium was to be taken out of the country. The US rejected the deal, and voted聽instead聽to impose a new round of UN sanctions.

Rouhani鈥檚 visit comes as top US and Iranian nuclear negotiating teams meet in Geneva for two days of bilateral meetings to break an impasse in nuclear talks before a聽July 20聽deadline to reach a deal.