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.
The White House is beginning to create the impression that Taiwan is an unwanted irritant to what would otherwise be a happy, fruitful, productive relationship between Washington and Beijing.
"We are looking forward to a professional and productive relationship with the Iraqi authorities over the next few days ... and time will tell, " said UNSCOM spokeswoman Caroline Cross.
"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.
The president said a productive relationship with China was still possible, even if that country held onto a Navy reconnaissance plane that has been held there since April 1, when its pilot made an emergency landing on the Chinese island of Hainan after a collision with a Chinese fighter jet.
We want a normal, productive, healthy relationship with Iraq going forward.
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.
The President places great importance on this relationship because there are few diplomatic, economic or security challenges in the world that can be addressed without China at the table and without a broad, productive, and constructive relationship between our countries.
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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