The United Nations imposed tough sanctions on North Korea last month following its third nuclear test.
Tension is high on the Korean peninsula following North Korea's third nuclear test on 12 February.
Rice said Tang delivered a strong message to Kim about the seriousness of the nuclear test.
We're getting different estimates now of the scale of North Korea's nuclear test today.
Fifteen years have now elapsed since the United States last conducted an underground U.S. nuclear test.
But Beijing has been displeased by Kim's lack of outreach and his February nuclear test.
The United Nations imposed fresh sanctions against North Korea following its nuclear test on 12 February.
Tension has escalated in the wake of North Korea's third nuclear test last month.
North Korea conducted a nuclear test on Monday and fired five short-range missiles Monday and Tuesday.
CNN: Clinton slams N. Korea's rhetoric, 'belligerent' actions
Don't waste the taxes of ordinary Chinese to support North Korea's nuclear test and other things.
The confirmation came three hours after seismic activity was detected at North Korea's nuclear test site.
The latest North Korean underground nuclear test represents both a danger and an opportunity.
It also warned Pyongyang it would face "significant action" if the planned nuclear test went ahead.
BBC: S Korea leader warns of 'multiple' N Korea nuclear tests
The resolution warned of "significant action" if Pyongyang conducted another rocket launch or a nuclear test.
North Korea's nuclear test has refocused Washington on the nuclear proliferation threat in Asia.
The UN resolution pledged "significant action" if North Korea carried out a third nuclear test.
Security Council will hold an emergency meeting Tuesday morning on North Korea's nuclear test.
We will strive for the early entry into force of the Comprehensive Nuclear Test-Ban Treaty.
White House spokesman Tony Snow is playing down the significance of North Korea's apparent nuclear test.
The nuclear test and the firing of six short-range rockets occurred in late May.
It is a replica of Chagai, the site of Pakistan's nuclear test last year.
The magazine published an article describing the day after Iran performs a nuclear test.
First, ending the stalemates on the Fissile Material Cut-off Treaty and the Comprehensive Nuclear Test Ban Treaty.
Since the nuclear test in February, North Korea has threatened to strike at U.S. bases in Asia.
The announcement follows a fresh round of UN sanctions punishing Pyongyang for its nuclear test last month.
President Bush calls for a decisive United Nations response to North Korea's claims of a nuclear test.
One of China's leading newspapers, The Global Times, again warns North Korea against conducting another nuclear test.
North Korea said the nuclear test was a response to the "reckless hostility of the United States".
BBC: North Korea nuclear test branded 'serious threat' to US
Even so, I cannot say the motivation behind North Korea's nuclear test is for Kim's pride alone.
The Security Council also committed to take additional measures in the event of another nuclear test or launch.
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