According to a report by Korea JoongAng Daily, China appears to be preparing measures in case North Korea tests a nuclear device or performs another provocation, including possibly suspending oil to the regime, and adds that relations between Beijing and Pyongyang appear frostier than ever before.
Additionally, the Korea publication references the Chinese-language Boxun News, which cites a Beijing source, according to whom Chinese President Xi Jinping attempted to send Wu Dawei, China’s special representative for Korean Peninsula affairs, to Pyongyang after his summit with U.S. President Donald Trump, but North Korean leader Kim Jong-un allegedly rejected Wu’s visit.
Boxun adds that it was unclear if North Korea did not conduct a sixth nuclear test last Saturday because of Beijing’s warning not to do so, however it adds that according to "analysts" there’s a high likelihood of a provocation on the 85th anniversary of the founding of the North Korean People’s Army next Tuesday and the days leading up to the South Korean presidential election on May 9.
Citing its Chinese source, Boxun said that "China believes there is the “highest possibility” of a nuclear test on April 25, but “does not leave out the possibility it might take action in early May."
One assumes the Carl Vinson, wherever it may be in the world currently, will eventually make it to North Korea by then.