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.'
Talks on denuclearization have been largely deadlocked since a second summit between Trump and Kim in Hanoi collapsed at the start of this year.
The prisoner exchange is expected to take place near the town of Gorlivka in the Donetsk region.
Putin, who will shortly mark two decades since Boris Yeltsin dramatically handed him the presidency at the start of 2000,faced the media with Russia still isolated internationally and speculation growing about his own plans when his mandate ends in 2024.
The class action, which must still be certified, is seeking Can$150 million (US$115 million) in damages.
It is the latest in an uptick in rocket attacks targeting either Iraqi bases where American troops are located or the US embassy in Baghdad.
