WASHINGTON (AFP) - The United States is pressing for very tough new sanctions against Iran this month, a top US aide said Sunday, suggesting that the move could help bring about regime change. Were... going through the UN this month to present sanctions, US President Barack Obamas national security advisor, Gen (retd) James Jones, told Fox News Sunday. While the US is not actively seeking to destabilise Iran, which has been rocked by months of anti-government protests since disputed elections last year, Jones said additional sanctions could nevertheless have that effect. We know that internally there is a very serious problem. Were about to add to that regimes difficulties by engineering, participating in very tough sanctions, which we support, he said. Not mild sanctions. These are very tough sanctions. A combination of those things could well trigger a regime change - its possible. Jones said, The combination of internal and external problems are certainly not going to make life easier for the government of Iran. Jones claimed there was already tremendous support for new sanctions against Iran, but admitted: We need to work on China a little bit more. Russia is supportive and is on board, and has been a steady friend and ally on this with President Obama, he said, warning: I think Iran needs to weigh very carefully how it wishes to proceed. Meanwhile, US State Secretary Hillary Clinton said Sunday that Iran faces greater costs for taking provocative steps, and warned of new measures to convince Tehran to change course in its nuclear drive. Iran leaves the international community little choice but to impose greater costs for its provocative steps, Hillary said in a speech at the US-Islamic World forum in Doha. Together, we are encouraging Iran to reconsider its dangerous policy decisions, the US diplomatic chief said. We are now working actively with our regional and international partners, in the context of our dual track approach, to prepare and implement new measures to convince Iran to change its course, she said. Hillary flew in to Qatar on Sunday on the first leg of a Gulf tour aimed at ramping up the pressure on Iran over its controversial nuclear programme. The US chief diplomats three-day trip, which will also take her to Saudi Arabia, is aimed at enlisting broad regional support, including from Turkey, in a drive to stop Irans sensitive nuclear work, her aides told reporters. Ahead of his talks with Hillary, Turkish Prime Minister Recep Erdogan said Turkey was willing to serve as the venue for an exchange of Iranian nuclear fuel in any settlement between Tehran and the West. The International Atomic Energy Agency has said Turkey could serve as the centre for the exchange of uranium ... but there is no agreement up until now, he told a Doha press conference. On the second leg of her tour on Monday, Hillary Clinton will press Saudi officials to use their influence with China to secure a change of heart, aides said. But they neither confirmed nor denied suggestions that she would ask Saudi leaders to offer China, which imports much of its oil from Iran, supply guarantees in return for Beijings support for new UN sanctions.