TEHRAN (Reuters/AFP) - Irans leading authority accused the US on Tuesday of promoting terrorism in border areas and using arms and money against the Islamic state, in his latest verbal attack on Tehrans arch-enemy. Supreme Leader Ayatollah Ali Khameneis comments in a televised speech are likely to further disappoint the US administration of President Barack Obama, which is seeking rapprochement with Iran after three decades of mutual mistrust. Khamenei was speaking in a western region close to Iraq where security forces often clash with Kurdish separatist rebels. Iran has also in the past accused its Western foes of seeking to destabilise it by backing insurgents on its borders. I say this firmly that unfortunately across our borders, our western borders, the Americans are busy making a conspiracy, they are busy fostering terrorism, he said, referring to the US presence in Iraq, Irans western neighbour. Money, arms and organisation ... are being used by the Americans directly across our western borders in order to fight the Islamic Republics system. We should be awake, he said during a visit to Irans Kurdistan province. The Americans have dangerous plans for (Iraqi) Kurdistan ... Their plans are not aimed at defending the Kurdish people, but they want to control them, he said in the city of Saqaz. Our Kurdish friends on the other side of the border have told us that the US officers are paying the Kurdish youth on the Qandil hills in exchange for information, he said. They pay money to create mercenaries. It is unworthy of Kurdish youth, Khamenei added. Anywhere they (the Americans) can, they stretch their hands in order to put their contemptible and bloody claws into the body of the Kurdish people, Khamenei said. Like Iraq and Turkey, Iran has a large Kurdish minority, mainly living in its northwest and west. Kurdish guerrillas based in remote mountainous areas in Iraq close to Turkey and Iran have long been a source of regional instability. Khamenei spoke a day after Obama said he wanted to see serious progress on his diplomatic initiative towards Iran by the end of the year. Obama also held out the prospect of tougher sanctions against Tehran to ensure that Iran understands we are serious. Washington and its Western allies suspect Irans nuclear programme is aimed at making bombs, a charge Tehran denies. But in a break with his predecessor George W Bushs approach, Obama has offered direct talks with Tehran to resolve the dispute. Iran says Washington must show a real policy shift towards it. The Islamic republic has seen its regional influence grow since the 2003 ouster of Saddam Hussein in Iraq, sparking unease among Sunni Arab powers. In other comments underscoring deep suspicion of the United States, Khamenei last month blamed US forces for two bombings that killed dozens of Iranian pilgrims in Iraq. Ali Ansari of the University of St Andrews in Scotland said he believed Khamenei was trying to rein in moderate candidates in Irans June 12 presidential election who are advocating constructive talks and better ties with the West. He said Khamenei was ideologically disinclined to relations with Washington but was not closing the door to a possible opening. The US cut bilateral ties shortly after Irans 1979 Islamic revolution. Khamenei on Monday urged Iranians to support anti-Western candidates, without openly supporting Ahmadinejad who is a vocal opponent of western policies. Do not let those who would ... surrender to enemies (the West) and harm our nations prestige to get into office, Khamenei said in a televised speech in the western city of Bijar.