New US Secretary of State Condoleezza Rice has praised Poland's role in Iraq.
Ms Rice made the remarks during a stop-over in Warsaw - part of her first overseas tour since taking the job.
She said the US understood there would be certain changes after the Iraq poll - a reference to Polish plans to withdraw some troops later this month.
From Poland, Ms Rice is due in Turkey where she is also due to meet her Russian counterpart. The trip has been dominated by US concerns over Iran.
After beginning the tour in London, Ms Rice went on to Berlin where, after talks with German Chancellor Gerhard Schroeder on Friday, she called on Europe to show "unity of purpose" with Washington in opposing Iran's nuclear programme.
" Diplomacy can work in this case "
"Diplomacy can work" in resolving tensions over Tehran's nuclear ambitions, she said.
But Iran had to show it was prepared to live up to its obligations, she said.
The EU has tried to negotiate with Tehran over its nuclear activities, but the US has urged a tougher stance.
The US failed last year to get Iran reported to the UN Security Council to face possible sanctions.
France, Germany and the UK are now negotiating with Iran to turn a freeze on its nuclear enrichment activities into abandonment.
" I don't think Ms Rice will be able to do anything to improve US image abroad "
In London, Ms Rice insisted that attacking Iran was not on the US agenda "at this point in time".
But in a BBC interview to be shown on Sunday's Breakfast with Frost programme, Ms Rice said Iran was the "chief funder of terrorism".
Iran was the key supporter of Palestinian "rejectionist groups" and the Hezbollah movement, which she said were "one of the most important barriers" to Middle East peace.
"Iran is a destabilising force in the international system," she said.
RICE'S SEVEN-DAY TOUR
In Iran, state-run television said Mr Rice was continuing the American trend of "psychological warfare" against the Iranian people.
Ms Rice's week-long tour of Europe and the Middle East includes talks with the Israeli and Palestinian leaders.
During the rest of the trip, Ms Rice is expected to give a staunch defence of President George W Bush's stated aim of spreading freedom and democracy around the world in what is seen as a bid to mend relations with nations opposed to the Iraq war.
Ms Rice will round off the trip by making a major speech on US-EU relations in Paris.
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