The US has also congratulated Mr Tadic, saying it wanted to build a productive relationship with Serbia.
But the election offers an important opportunity to forge a more productive relationship.
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We believe we have a very, very productive relationship between our two countries.
It's time to forge a practical, productive relationship that will lead to normalization of diplomatic relations between the U.S. and Venezuela.
And Obama and Secretary of State John Kerry have expressed their desire to forge a more positive and productive relationship with Venezuela.
"Notwithstanding the significant differences between our governments, we continue to believe it important to seek a functional and more productive relationship with Venezuela based on issues of mutual interest, " he said.
We have made clear that if Iran lives up to the obligations that every nation has, it will have a path to a more prosperous and productive relationship with the international community.
WHITEHOUSE: Statement by President Barack Obama on Iran | The White House
In Hong Kong, I watched a newly-arrived American executive meet with his Chinese team members, and I saw the new man destroy in five seconds the delicate and productive relationship that the incumbent had taken over a year to build.
But they also expect that the United States would engage, as another part of its multidimensional responsibilities in the region, to engage in a productive and constructive relationship with the Chinese.
I've talked to people on the U.S. side about this, and some suggest that there would be a reluctance to simply cut off that relationship, because it seems to be productive.
Bush also talked at length about China, describing a "difficult" and "complex" relationship, but he maintained the United States could still have productive ties with the country, particularly in the area of trade.
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