Xi urged the multi-billionaire to "continue to play an active role in promoting China-US economic and trade cooperation", the official Xinhua news agency said.
'There is never a justification for violence. No excuses, no exceptions: America is a nation of laws,' he said.
The ministry did not specify if the signal was detected from the downed plane's black box.
The Sriwijaya Air Boeing 737-500 plunged into a steep dive about four minutes after it left Soekarno-Hatta international airport in Jakarta on Saturday afternoon.
'One of the few things he and I have ever agreed on,' Biden said. 'It's a good thing, him not showing up.'
President Donald Trump's administration took the extraordinary step of bypassing Congress to approve the sale of aircraft support maintenance, munitions and other weapons to Saudi Arabia and the United Arab Emirates as well as a transfer of existing weapons to Jordan.
Xi is the first Chinese president to visit North Korea in 14 years after relations between the Cold War era allies deteriorated over Pyongyang's nuclear provocations and Beijing's subsequent backing of UN sanctions.
According to investigators, Denali Brehmer, an 18-year-old from Alaska, was recruited to kill her friend by a man a few years her elder, 21-year-old Darin Schilmiller of Indiana.
Assisted suicide is illegal in most countries and was banned in Australia until Victoria state introduced laws to legalise the practice in 2017.
President Ibrahim Boubacar Keita has appealed for an end to the revenge attacks after he visited the site of the Sobane Da massacre.
