The United States' State Department said it had contacted the two countries and called on them to "use the existing direct communication links between them to avoid further escalation".
The United States has apologized to China for misusing President Xi Jinping's title in a transcript, Foreign Ministry spokesman Geng Shuang said on Monday.
The United States on Monday removed the label of "currency manipulator" from China, a move experts said is "just recognizing reality" and will be welcomed by investors.
The US Defense Department's Nuclear Posture Review, released on Feb 2, outlines the Pentagon's plans to expand its nuclear capabilities to deter others. It claimed that China's "lack of transparency regarding the scope and scale of its nuclear modernization program raises questions regarding its future intent".
The UW team, which included students from the electrical engineering department and the computer science school, won first place with its Sounding Board?bot that earned an average score of 3.17 on a 5-point scale from the panel of judges and?achieved an average conversation duration of 10:22.
The US State Department said on Thursday the denuclearization of Pyongyang has to come first before the U.S. side gives any corresponding reciprocal measures.
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The US signed an agreement with the Taliban last month for a phased withdrawal of US forces if the Taliban keeps its commitments. It also prescribed the start of talks between the insurgents and an Afghan government delegation on a political settlement to end decades of conflict.
The US dollar as a global reserve currency, on the one hand, contains certain costs and can be burdensome to the US economy. On the other hand, this phenomenon has brought tremendous benefits to its own economy and consumers.
The UN chief also called on sectors to "act across an array" to address the conflicting demands from industry, fishing, shipping, mining and tourism that are creating unsustainable levels of stress on marine and coastal ecosystems.
The Under 2 MOU is a government coalition that refers to limiting warming below 2 degrees Celsius, which the Intergovernmental Panel on Climate Change (IPCC) scientists say is needed to avoid dangerous consequences.