BRUSSELS (AFP) - Poland urged the United States Sunday to live up to past commitments on missile defence as Washington reviews plans to expand its system into Europe, including basing interceptors in Poland. "We hope we don't regret our trust in the United States," Polish Foreign Minister Radoslaw Sikorski said at the Brussels Forum conference to an audience of senior world politicians and experts. Russia was enraged by the US missile plans - which the previous US administration under George W Bush said was needed to counter a threat from Iran - but has welcomed the review ordered by President Barack Obama. "When we started discussing this business with the United States, the US assured us that they would persuade Russia," Sikorski said. The United States has been negotiating with Poland and the Czech Republic to install 10 missile interceptors, which would not carry explosive warheads, and a radar system on their territories to expand its shield into Europe. Russia sees the system as a threat to its security. Moscow even threatened to deploy Iskander missiles to Kaliningrad, a Russian exclave wedged between NATO and EU members Poland and Lithuania, if Washington did not halt the planned extensions. But it was assuaged by Obama's decision to order a review of the multi-billion dollar project to see whether it is still technically feasible and cost effective. Obama has also offered Tehran a "new beginning" to turn back the tide on decades of mutual distrust. "I am afraid Russian generals and even the Russian president continue to threaten us with the deployment of medium-range missiles," Sikorski said. "Poland has taken a political risk in signing up with the previous administration," he added. Last month, Polish Defence Minister Bogdan Klich said talks with Washington on the plan, and in particular the stationing of US Patriot missiles in Poland and other benefits Poland stood to gain, were ongoing. But Czech officials have said they would be prepared to wait three years for work on the radar base to begin. Polls show the Czech public is largely opposed to the system.