Trump and Xi are supposed to meet at the upcoming G20 summit. Here's why experts say the outcome will dictate the fate of the entire stock market.

Andrew Harnik/AP

FILE - In this Nov. 8, 2017, file photo, U.S. President Donald Trump, second left, first lady Melania Trump, left, Chinese President Xi Jinping and his wife Peng Liyuan stand together as they tour the Forbidden City in Beijing, China. As President Donald Trump steers his administration's focus inward, China has stepped into what many see as a U.S.-sized void left behind in Southeast Asia. (AP Photo/Andrew Harnik, File)

• President Donald Trump and Chinese President Xi Jinping may meet in Japan later this month at the annual G20 summit to discuss trade relations, but those plans are still up in the air.
• Equity strategists and economists say that whether or not the two leaders convene - and what is discussed - will impact the direction of the US stock market, which has enjoyed a rally this year.
• Visit Markets Insider's homepage for more stories.

The planned meeting between President Donald Trump and his Chinese counterpart Xi Jinping at the annual G20 summit remains a high-stakes "will they, won't they" game.

Trump says he wants to meet with Xi later this month as trade tensions linger. Beijing has not confirmed any meeting, according to reports. And sources told Reuters this week that expectations are quite low in progress toward ending the US-China trade war that's raged on for more than a year.

Whether or not the two leaders convene in Osaka to discuss trade relations between the world's two largest economies will have implications for investors in US markets, according to equity strategists and economists.

Read more: China says trade pressure from the US 'will absolutely not succeed' as Trump vows to slap tariffs on $300 billion worth of products

With the Federal Reserve already assuming an accommodative posture in the face of slowing economic growth and volatile international trade tensions, any indication that relations are headed further south could sway the central bank's tightening path and influence the markets.

"We continue to see the Fed on hold through much of next year - a view that rests importantly on a market-positive outcome from the G20 meeting," Morgan Stanley strategists led by Ellen Zentner wrote Thursday in a note to clients.

As the Federal Open Market Committee is set to meet next week, ahead of the Osaka summit, Zentner's team expects the market to move in response to the news flow surrounding the G20 meeting.

Investors appear pessimistic about the state of the trade war given the MSCI China Index's recent underperformance relative to the MSCI USA Index, along with moves in the renmibi against the US dollar, said Oliver Jones, an economist at Capital Economics.

"There seems to be little expectation that another meeting at the next G20 summit this month will result in a fresh cease-fire," Jones wrote in a Thursday note to investors.

Capital Economics

Chinese and US equities, as well as renminbi/dollar exchange rate, against developments in the trade war.

"Indeed, it would probably come as little surprise to markets if the two sides imposed tariffs on virtually all bilateral goods trade, as we now think is likely," he said.

Jones also added that what's fueling his bearish view on equities is the belief that global growth will continue unabated, regardless of the trade war.

Some strategists say stock market investors - within arm's reach of record highs in the US - are stuck in a "wait-and-see" mode with the G20 summit on the horizon.

Athanasios Vamvakidis, Bank of America Merrill Lynch's global head of G10 foreign-exchange strategy, told investors Wednesday that the "rates market is too pessimistic, the equities market too optimistic," and the FX market is complacent.

Bank of America Merrill Lynch

The CAPE ratio vs. the value of global fixed income.

In other words, he argues global stocks should probably be trading a bit lower, rates should be a bit lower, and the foreign-exchange market should be trading in a more volatile fashion. That is, if they were all properly pricing in risk surrounding the US-China talks.

"We remain optimistic, but one can also argue that things could get worse before/if they get better, both before and after the G20," Vamvakidis said.

Stocks in the US were broadly positive Thursday, with the S&P 500 trading within 2% of its May 1 record.

A bonus just for you: Click here to claim 30 days of access to Business Insider PRIME

Now read more markets coverage from Markets Insider and Business Insider:

Beware a 'Trump recession': JPMorgan unloads on the president's role in erasing a full year of market progress - and lays out a scenario that could save the day

Oil is surging after a suspected torpedo attack on 2 tankers in the Gulf of Oman

The US budget deficit skyrocketed to a record $207.8 billion in May