American-Iranian rapprochement is nothing compare to the trauma of the American-Saudi relations. After all the Qataris are hopping to find a solutions with the Iranians, in order to jointly exploit the South Pars/ North Field natural gas filed, that lies in the Persian Gulf between Iran and Qatar. This is the largest natural gas field in the world, and you can see a rough sketch at the following map (red diagram).
As I said the problems between the Saudis and the Iranians is much more severe, because Iran is the main economic competitor of Saudi Arabia, a traditional US ally since 1945. The American-Iranian rapprochement is causing Saudi Arabia to look eastwards, towards its best client i.e. China. In the first paragraph of the following Reuters article, titled “Saudi Arabia warns of shift away from U.S. over Syria, Iran”, October 2013 you can read the following:
“Upset at President Barack Obama's policies on Iran and Syria, members of Saudi Arabia's ruling family are threatening a rift with the United States that could take the alliance between Washington and the kingdom to its lowest point in years”.
https://www.reuters.com/article/2013/10/22/us-saudi-usa-idUSBRE99L0K120131022
The US-Israel relations are another victim of the change of the American policy in the Middle East. The Israelis do not really mind whether Syria is under the influence of Iran or under the influence of Turkey and Qatar, since in both cases it would have to face a very hostile regime. However what really matters for the Israelis, is the rapprochement between USA and Iran, which is the true cause for the tolerance of the Assad regime on behalf of the USA.
The American-Israeli relations are at their lowest point in decades, and the Israelis are looking towards Russia. Russia has very good relations with Iran, but if Iran makes peace with the West and start selling its natural gas to Europe through Turkey, it would be tough competition for Russia’s Gazprom, and therefore the Russian-Iranian relations should deteriorate.
Therefore the tolerance towards the Assad regime is a byproduct of the American effort to reach an agreement with Iran. The fact that the Americans overlook the problems their rapprochement with Iran is causing in their relationships with their traditional allies in the region, shows how important Iran is for the US.
Kurdistan
The deterioration in the American-Turkish relations make the Americans and the Europeans to see very positively the establishment of an independent Kurdistan. Which are the exact borders of Kurdistan is an open question, but as you can see on the following Wikipedia map, the regions that historically have large Kurdish populations, expand from Iran to almost the Mediterranean Sea. However the Kurds are not the majority of the population in all these regions.
Source: Wikipedia https://en.wikipedia.org/wiki/Kurdistan#mediaviewer/File:Kurdish-inhabited_area_by_CIA_(1992).jpg
The Kurds are probably the West’s best friend in the Muslim world. Kurdistan lies in four countries, Turkey, Syria, Iraq and Iran. None of these countries want an independent Kurdistan, which makes the Kurds a natural ally for the Western world. There are 30 million Kurds in the world, and they are the largest ethnic group without a homeland, which gives rational for an independent Kurdistan, which is something that seems to suit western interests.
An independent Kurdistan would not be as big as the one on the above maps of course, but it would greatly strengthen the presence of the West in the region, especially in case the relations between US and Turkey at some point collapse. Moreover Kurdistan is next to Iran, which would again be a great help for the West in case the rapprochement between Iran and the West does not bear fruits. Moreover the Kurds would be extremely happy to have American military bases in their territories.
In the first paragraph of the following Reuters article, titled “Turkey's U.S. relations show strain as Washington's patience wears thin”, October 2014, you can read the following:
“The U.S. decision to air-drop weapons to Kurdish forces in Syria on the same day Turkish President Tayyip Erdogan dismissed them as terrorists is the latest false note in the increasingly discordant mood music coming out of Washington and Ankara.”
https://www.reuters.com/article/2014/10/23/us-mideast-crisis-turkey-idUSKCN0IC1Z520141023
Erdogan calls the Kurds terrorists, and the Americans drop weapons at them. At the following Wall Street Journal article, titled “Building the U.S.-Kurdistan Special Relationship”, July 2014, you can read the following:
2nd and 3rd Paragraph
“The time has come for America and the West to support Kurdish independence and, simultaneously, to set up U.S. bases in Iraqi Kurdistan that would make it America's military hub in the region.
After all, this country-in-the-making has proved to be a haven of stability, relative security and pro-American, pro-Western sentiment ever since it broke free from Saddam's misrule.”
And the article continues in the 12th and 13th paragraphs
“U.S. military planners can't assume that our alliance with Turkey won't decline further. Nor should they assume as given Turkey's military cooperation with NATO for missions against adversaries in places like Syria and Iran.
And it would be even more foolish for American policy makers to assume that U.S. forces will always be able to use bases in Kuwait, Qatar and Bahrain. All three countries are dictatorships vulnerable to upheaval. So far, adroit use of their fantastic wealth has protected these countries' rulers against the resentments of their subjects, but this may not always be the case.”
https://online.wsj.com/articles/the-u-s-should-guarantee-kurdish-independence-1405020652
Finally the title of the following Guardian article says it all. The title of the article is “US and Turkey’s push and shove diplomacy has Kurds in the middle. Washington wants Erdogan to do more to back the Kurds in Kobane, while Ankara insists Assad should be removed first”.
The title says the whole story, because what Erdogan is really saying to the Americans is the following:
“I am willing to help the Kurds, I am willing to help you with ISIS, but Assad, which is the Iranian ally in Syria, must go first. Only if Syria is controlled by me (Erdogan), and Iran is totally dependent on me (Erdogan again), I can fight ISIS and help the Kurds”. Of course Erdogan does not say that openly, but that’s what he is thinking and everybody knows it. The problem is that the West does not like the way he is thinking, and it does not like that Turkey has become such an important player.
https://www.theguardian.com/us-news/2014/oct/07/us-turkey-diplomacy-isis-kurds-kobani
In the following Financial times article, titled “Turkey demands US target Assad as price of co-operation”, October 2014, you can read that Erdogan demands Assad’s overturn in order to help the Americans with the Kurds.
https://www.ft.com/intl/cms/s/0/a0da17d2-4d71-11e4-bf60-00144feab7de.html
A natural question is why would Erdogan help the Kurds at all, given that there are millions of Kurds in Turkey asking for an independent Kurdistan? Obviously Erdogan would not like to help the Kurds at all, but he simply can’t ignore them, especially when the West sees them favorably. But we should not see the Kurds as one solid group. The two main Kurdish political parties are Ocalan’s PKK in Northern Kurdistan (Turkey), and the Barzani’s KDP in Southern Kurdistan (Iraq).
These two groups are competing for influence and in the past they have actually been fighting each other. Erdogan is obviously favoring Barzani’s KDP in Northern Iraq, and not Ocalan’s PKK in Turkey. Actually to make things worse for the Kurds, Erdogan is helping the Iraqi Kurds of KDP to export oil from the oil fields they control in Northern Iraq. He does so in order to make it harder for Iraqi Kurds to unite with Turkish Kurds. In the first two paragraphs of the following France 24 article, titled “Kurdish factions unite in fight against jihadists in Iraq”, August 2014, you can read the following:
“Fighters from the Kurdistan Workers Party (PKK), a Kurdish guerilla faction in Turkey, joined forces with the regular Peshmerga forces of the Kurdistan Regional Government (KRG) in northern Iraq to oust radical Sunni extre
mists from the town of Makhmour. FRANCE 24’s special correspondents in Iraq report that the battle of Makhmour marks the first time the PKK and KRG forces have fought side by side. Despite years of infighting, both factions want to prevent Islamist militants from gaining a foothold in Kurdish territories and redrawing the borders of the region”.
https://www.france24.com/en/20140813-video-kurdish-factions-unite-fight-against-isis-peshmerga-pkk-islamic-state/
In the first and second paragraphs of the following American Center of Democracy article, titled “Kurdistan Oil Export: A game changer”, June 2014, you can read the following:
“In late May 2014 Turkish officials announced that oil from Iraqi Kurdistan had just been exported to international markets……..The May 2014 announcement that a million barrels of Kurdish oil had been exported to Europe through Ceyhan seems to have caught everyone by surprise”.
https://acdemocracy.org/kurdistan-oil-export-a-game-changer/
In the first paragraph of the following article of the Kurdistan Tribune, titled “Ocalan v. Barzani: Two contradictory worlds”, May 2013, you can read the following:
“The Kurdistan Workers Party (PKK) and its legendary leader, Abdulla Ocalan, pose a strong challenge to the Kurdistan Democratic Party (KDP) and its leader, Masoud Barzani. The PKK
The Crisis in the American-Turkish Relations: The Creation of an Independent Kurdistan Page 3