China: ...When Trump sits down for dinner with Xi, trade will be on the menu. The United States and China are in the midst of a trade fight that is scheduled to escalate Jan. 1. That's when the 10 percent tariffs the Trump administration imposed on Chinese goods are set to amp up to 25 percent. And if that were to happen, China would inevitably retaliate, as it already has for earlier U.S. tariff announcements...
...Major sticking points include intellectual property theft, forced technology transfers, tariffs and other barriers to free and fair trade...
[According to a China trade expert from the Brookings Institution], "The markets are looking for some kind of dialing down of the rhetoric, and in particular markets are hoping there will not be an escalation of U.S. tariffs on Jan. 1," Dollar said...
Russia: ...This new meeting comes as Russian aggression toward Ukraine recently intensified. Over the weekend, Russian vessels reportedly fired on Ukrainian ships in the Black Sea, seizing three vessels and injuring Ukrainian sailors.
U.S. officials all the way up to Secretary of State Mike Pompeo strongly condemned the Russian action, and in an
interview with The Washington Post, President Trump said he was even considering pulling out of the Putin meeting in Argentina as a result. "Maybe I won't have the meeting," Trump said. "Maybe I won't even have the meeting. We're going to see."
"I don't like that aggression," Trump said in his Post interview. "I don't want that aggression at all."
For his part, Putin has blamed Ukraine for the incident, accusing the Ukrainian president of orchestrating the whole thing for political gain.
As of now, the Trump-Putin meeting is still on.
If it does happen, one open question is whether Trump will confront Putin on Russia's provocative actions against Ukraine or defer to his denials, once again.