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* Trump to restore tariffs on Brazil, Argentina imports
* Chinese PMI numbers come in better than expected
* U.S. ISM manufacturing PMI due at 10 a.m. ET
* Retail stocks in focus on Cyber Monday
* Futures flat: Dow up 0.1%, S&P up 0.09%, Nasdaq up 0.01% (Adds comments, updates market action)
By Arjun Panchadar
Dec 2 (Reuters) - Wall Street's main indexes were set to open flat on Monday as President Donald Trump said he would restore tariffs on metal imports from Brazil and Argentina, with investors shrugging off a surprise rise in Chinese manufacturing activity.
Trump said in a tweet he would immediately restore tariffs on U.S. steel and aluminum imports from Brazil and Argentina, surprising officials in the two South American countries and prompting them to seek explanations.
The news sent shares of steel makers including U.S. Steel Corp and AK Steel Holding up 1.4% and 2.5% in premarket trading.
"The concern here is what kind of retaliatory response those countries might have, let alone sort of a re-escalation of these tariff wars in the midst of trying to resolve one," said Mark Luschini, chief investment strategist at Janney Montgomery Scott in Philadelphia.
U.S. stock index futures were earlier up about 0.4% after data showed China's factory activity expanded at its fastest pace in three years, reinforcing upbeat government data released over the weekend.
The data follows a clutch of mixed headlines on U.S.-China trade last week. Hopes of an imminent "phase one" trade deal and upbeat U.S. economic data sent Wall Street to record highs early in the week, but sentiment dulled on Friday after China issued a sharp rebuke to a U.S. law supporting protesters in Hong Kong.
Recent numbers from the United States have indicated that the domestic economy continues to be resilient despite signs of flagging global growth, a message reinforced by the Federal Reserve.
All eyes will now be on the ISM manufacturing activity survey for November, due at 10 a.m. ET. The reading is expected to rise to 49.2 from 48.3 in October.
Retail stocks also remained in focus, with Cyber Monday sales expected to hit a record following $11.6 billion in online sales on Thanksgiving and Black Friday. Walmart Inc, Amazon.com Inc and Target Corp gained about 0.3% in premarket trading.
At 8:57 a.m. ET, Dow e-minis were up 27 points, or 0.1%. S&P 500 e-minis were up just 2.75 points, or 0.09% and Nasdaq 100 e-minis were up 0.75 points, or 0.01%.
Among other stocks, Roku Inc fell 7.9% as Morgan Stanley downgraded the video streaming device maker's shares to "underweight from "equal-weight".
Splunk Inc rose 2.5% after Goldman Sachs upgraded shares of the company to "buy" from "neutral". (Reporting by Arjun Panchadar and Sruthi Shankar in Bengaluru; Editing by Saumyadeb Chakrabarty and Arun Koyyur)