Trump, who rarely caves to public pressure and has never used meetings with leaders as leverage to change their behavior, may have been influenced by developments in special counsel Robert Mueller's probe into Russian meddling during the 2016 campaign.

As quickly as the meeting was called off, it could potentially be put back on. Stay tuned.

In the meantime, Russia is doubling down despite the West's condemnation, transferring the Ukrainian sailors to a notorious Moscow prison and preparing to put them on trial. Allies are urging Trump to highlight the aggressive incident and demand the Ukrainians' release here on the world stage.

4. Meet NAFTA 2.0: Does it pay for the wall?

Trump is expected to formally ink the new U.S.-Mexico-Canada trade agreement, or USMCA, just one day before his Mexican counterpart Enrique Pena Nieto leaves office. The deal between Trump, Pena Nieto and Canadian Prime Minister Justin Trudeau brings to a close a bruising battle between allies and fulfills a key promise of Trump's presidential campaign.

\"That deal will be signed in Argentina with the U.S. and Canadian representatives,\" Kudlow said.

The White House has outlined broad benefits of the deal for Americans: boosting car and car-part manufacturers, raising minimum wage requirements for auto workers, opening Canada's dairy market to U.S. farmers and beefing up protections for intellectual property rights.

But what's in the fine print? And will Congress and legislatures in Canada and Mexico buy it? All three will need to approve the agreement for it to take effect.

And as for Trump's longstanding promise that he would use trade negotiations with Mexico to extract payment for a $25 billion border wall, there's no indication that was resolved in the deal, much less even discussed in negotiations.

\"PHOTO:
Agustin Marcarian/Reuters
PHOTO: Argentina's President Mauricio Macri, right, and France's President Emmanuel Macron attend a news conference in Buenos Aires, Nov. 29, 2018.
>

5. How will Trump handle distractions at home?

It's not the first time Trump has arrived at a major international summit beset by fresh controversy at home. Mueller's surprise revelation Thursday that he'd reached a plea agreement with Trump's former personal attorney Michael Cohen put the president on the defensive as he left town.

Does the president, known to fume about his frustrations with the Mueller probe, take it in stride and stay focused on the international diplomacy at hand? Or, does he use each photo op and press availability to vent and keep the headlines on the story he says he hates?

6. Will there be a security scare?

With more than two dozen world leaders gathering in one place, security officials are nervous. Friday has been declared an impromptu federal holiday, with authorities telling residents to stay out of town.

Several bomb threats and attempted attacks have kept authorities on edge, and hundreds of thousands of protesters are expected to take to the streets.

In the last few days, there have been bomb scares forcing evacuations of the main airport, a shopping mall, a bank in the center of town and the U.S. ambassador's residence. As far as is known, none of the threats were serious -- just suspicious bags left in places while security officials are on high alert. The bag at the shopping center was filled with chicken parts and the bag at the embassy was filled with lights for a professional photo shoot nearby.

However, two real bombings the week before at a cemetery and the house of a federal judge have security officials on edge. A young woman was injured when the homemade explosive device she was handling went off in Recolleta cemetery, a favorite tourist destination and where Evita Perón is buried. Later the same afternoon, a young man was arrested after throwing a bomb at the home of a federal judge.

\"PHOTO:
Getty Images, FILE
PHOTO: North Korean leader Kim Jong-un shakes hands with President Donald Trump during their historic U.S.-DPRK summit at the Capella Hotel on Sentosa island on June 12, 2018 in Singapore.
>

7. Will Trump get along?

During his most recent appearance on the world stage, Trump lashed out, enraged in particular by French President Emmanuel Macron's denunciation of nationalism just days after Trump said he identified as a nationalist, according to a Western diplomat who was present.

His anger over feeling slighted was also on display after the G-7 meeting in June, when Trump tweeted that that the Canadian prime minister was \"very dishonest and weak\" and accused him of lying after Trudeau reiterated his opposition to U.S. tariffs on Canadian steel and aluminum.

World leaders have gotten used to it, the diplomat said, and often little action comes of it. But with so many meetings, it's possible that Trump get angry and sounds off again.

ABC News' Joe Goldman contributed to this report.

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