(Updates prices throughout, adds spreadbetters, economist comment)
* MSCI ex-Japan gain 0.3 pct, Nikkei pares gains
* U.S., Mexico reach NAFTA deal, turn up pressure on Canada
* Analysts approach risk rally with caution
* Some major currencies rally against the dollar
By Swati Pandey
SYDNEY, Aug 28 (Reuters) - Asian shares advanced on Tuesday and the U.S. dollar hovered near its lowest in a month, with risk appetite sharpened by the United States and Mexico reaching a deal to overhaul the North American Free Trade Agreement.
Investors expect Canada would also agree to new terms to preserve a three-nation pact, ultimately dispelling the economic uncertainty prompted by U.S. President Donald Trump's repeated threats to ditch the 1994 NAFTA accord.
The improved trade outlook was also boosted by news that Washington was pressing the European Union to accelerate tariff talks.
Spreadbetters pointed to a firm start for Europe, with FTSE futures 0.6 percent higher and the CAC and DAX indexes slightly firmer.
MSCI's broadest index of Asia-Pacific shares outside Japan climbed 0.4 percent for a second straight day of gains. Australian shares added 0.7 percent while Japan's Nikkei pared early gains to end 0.1 percent higher.
Chinese shares were in the red. Shanghai's SSE Composite was off 0.2 percent and the blue-chip index down 0.3 percent as the Sino-U.S. trade dispute wears on.
The United States and China held two days of talks last week without a major breakthrough as their trade war escalated with the activation of another round of duelling tariffs on $16 billion of each country's goods.
Worryingly, consultancy KPMG has predicted a recession for the global economy were there to be an all-out tariff war.
"Globally, the effects of a substantial number of other countries introducing protectionist measures such as a 15 percent tariff on imports would be very significant," KPMG Australia Chief Economist Brendan Rynne said in a note on Tuesday.
"The world economy would contract by more than 3 percent."
Disputes between the United States and its trading partners have been a drag on investor sentiment for much of the year despite solid economic fundamentals and two robust quarters of corporate earnings.
Some analysts were cautious about Tuesday's rally.
"News of the U.S.-Mexico trade deal has fuelled risk appetite," ANZ analysts said in a client note. "It is hard to extrapolate much out of it, as the United States continues to treat each country and deal on its own merit. We remain wary of the current rally in risk appetite, and see it as short-lived."
Investors will keep a close eye on U.S. economic data with consumer confidence figures due later in the day and the latest estimate for second-quarter gross domestic product expected on Wednesday.
The dollar index paused near one-month lows against major currencies to stand at 94.83.
Against the yen, the greenback held at 111.24.
The euro was near a one-month top at $1.1677.
The Australian dollar, which is often used as a liquid hedge for global growth, was a tad lower at $0.7331 but well above a 1-1/2 year trough of $0.7203 touched earlier this month.
Oil prices gave up gains, with Brent down 9 cents at $76.12 a barrel and U.S. crude 11 cents weaker at $68.76.
Gold was subdued with spot prices off a touch at 1,210.44 an ounce.
Reporting by Swati Pandey; Editing by Neil Fullick