The New York Times reports: "Secretary of State John Kerry warned China on Wednesday that North Korea was moving ahead with an effort to manufacture a nuclear weapon small enough to fit atop a long-range missile that could reach American shores, and said the United States 'will do what is necessary to protect the people of our country.'...A draft of new sanctions was sent to China about 10 days ago, but by the time Mr. Kerry arrived in Beijing, China had not responded in substance, American officials said. Negotiations on their content will proceed in the coming days, Mr. Wang said. But these new sanctions 'must not provoke new tensions,' he added....Hours after Mr. Kerry and Mr. Wang met, South Korea warned that North Korea might be preparing to launch a long-range rocket."