Pyongyang accused the U.S. of "unilaterally reneging on its commitments" and said North Korea is "gradually losing our justification to follow through" on its own promises.
The two countries are marking the 70th anniversary of their establishment of diplomatic relations. But some experts believe Xi Jinping's trip has another purpose.
The leaders are scheduled to meet on Thursday, according to Chinese and North Korean news agencies. The visit comes after stalled negotiations with President Trump.
Contrary to prevailing stereotypes, in Anna Fifield's reported story Kim is anything but a madman — cold-blooded, for sure, but playing a calculated defensive strategy aimed at standing up his rule.
Kim Jong Nam, who was attacked with a deadly nerve agent in a Malaysian airport in 2017, was in the country to meet with his CIA handler, according to The Wall Street Journal and a new book.
The country's official newspaper reported leader Kim Jong Un supervised the test and is continuing to upgrade his country's military. The report said the weapon carried a "powerful warhead."
The North Korean leader shunted aside a pair of long-serving senior officials and seated a newly elected parliament. The move is thought to be aimed at helping Kim ride out U.S. sanctions.
South Korean President Moon Jae-in will visit President Trump in Washington on April 11, after U.S. denuclearization talks with North Korea recently fizzled.
Pyongyang blamed U.S. officials for the breakdown in talks in Hanoi last month and said North Korean leader Kim Jong Un will soon decide whether to end his country's voluntary moratorium on testing.