Looks like Israel is being as crafty as always. Foreign Policy reports:
... Azerbaijan is strategically located on Iran's northern border and, according to several high-level sources I've spoken with inside the U.S. government, Obama administration officials now believe that the "submerged" aspect of the Israeli-Azerbaijani alliance -- the security cooperation between the two countries -- is heightening the risks of an Israeli strike on Iran.
In particular, four senior diplomats and military intelligence officers say that the United States has concluded that Israel has recently been granted access to airbases on Iran's northern border. To do what, exactly, is not clear. "The Israelis have bought an airfield," a senior administration official told me in early February, "and the airfield is called Azerbaijan."
. . .
The Azeri embassy to the United States also did not respond to requests for information regarding Azerbaijan's security agreements with Israel. During a recent visit to Tehran, however, Azerbaijan's defense minister publicly ruled out the use of Azerbaijan for a strike on Iran. "The Republic of Azerbaijan, like always in the past, will never permit any country to take advantage of its land, or air, against the Islamic Republic of Iran, which we consider our brother and friend country," he said.
But even if his government makes good on that promise, it could still provide Israel with essential support. A U.S. military intelligence officer noted that Azeri defense minister did not explicitly bar Israeli bombers from landing in the country after a strike. Nor did he rule out the basing of Israeli search-and-rescue units in the country. Proffering such landing rights -- and mounting search and rescue operations closer to Iran -- would make an Israeli attack on Iran easier.
"We're watching what Iran does closely," one of the U.S. sources, an intelligence officer engaged in assessing the ramifications of a prospective Israeli attack confirmed. "But we're now watching what Israel is doing in Azerbaijan. And we're not happy about it."
Israel's deepening relationship with the Baku government was cemented in February by a $1.6 billion arms agreement that provides Azerbaijan with sophisticated drones and missile-defense systems. At the same time, Baku's ties with Tehran have frayed: Iran presented a note to Azerbaijan's ambassador last month claiming that Baku has supported Israeli-trained assassination squads targeting Iranian scientists, an accusation the Azeri government called "a slander." In February, a member of Yeni Azerbadzhan -- the ruling party -- called on the government to change the country's name to "North Azerbaijan," implicitly suggesting that the 16 million Azeris who live in northern Iran ("South Azerbaijan") are in need of liberation.
And this month, Baku announced that 22 people had been arrested for spying on behalf of Iran, charging they had been tasked by the Islamic Revolutionary Guard Corps to "commit terrorist acts against the U.S., Israeli, and other Western states' embassies." The allegations prompted multiple angry denials from the Iranian government.
It's clear why the Israelis prize their ties to Azerbaijan -- and why the Iranians are infuriated by them. The Azeri military has four abandoned, Soviet-era airfields that would potentially be available to the Israelis, as well as four airbases for their own aircraft, according to the International Institute for Strategic Studies' Military Balance 2011.
. . .
Access to such airfields is important for Israel, because it would mean that Israeli F-15I and F-16I fighter-bombers would not have to refuel midflight during a strike on Iran's nuclear facilities, but could simply continue north and land in Azerbaijan. Defense analyst David Isenberg describes the ability to use Azeri airfields as "a significant asset" to any Israel strike, calculating that the 2,200-mile trip from Israel to Iran and back again would stretch Israel's warplanes to their limits. "Even if they added extra fuel tanks, they'd be running on fumes," Isenberg told me, "so being allowed access to Azeri airfields would be crucial."
Former CENTCOM commander Gen. Joe Hoar simplified Israel's calculations: "They save themselves 800 miles of fuel," he told me in a recent telephone interview. "That doesn't guarantee that Israel will attack Iran, but it certainly makes it more doable."
There's much more at the link. Worthwhile reading . . . and reason to worry, if you're Iran!