United States officials are heading to Beijing next week for the first face-to-face talks.
Washington seeks to bring Iranian oil exports to zero in order to curb Tehran's missile.
The tweet that sparked the controversy wished Huawei followers a "Happy #2019."
China's services sector extended its expansion in December, a private survey showed on Friday, bucking a trend of downbeat economic data.
Qualcomm engaged in anticompetitive patent licensing practices to preserve a monopoly on modem chips.
The Trump administration has imposed 25 percent tariffs on a total of $50 billion in annual Chinese exports
International Brent crude futures were down 21 cents, or 0.4 percent, at 0258 GMT at $55.74 a barrel.
The two nations have been locked in a trade war for much of the past year, disrupting the flow of hundreds of billions of dollars worth of goods and stoking fears of a global economic slowdown.
Buffett sees Apple more as a consumer stock than a tech stock, reflecting the iPhone's status as a must-have possession for so many people.
The news sent Apple shares tumbling in after-hours trade and triggered a broader selloff in the stock market.
U.S. West Texas Intermediate (WTI) crude oil futures were at $45.93 per barrel at 0152 GMT, down 61 cents, or 1.3 percent, from their last settlement.
International Brent crude futures were at $53.47 per barrel at 0315 GMT, down 33 cents, or 0.6 percent, from their final close of 2018.
The MAS expects core inflation of between 1.5 and 2 percent in 2018, picking up to 1.5 to 2.5 percent in 2019.
The Southeast Asian economy is widely seen as benefiting from the U.S.-China trade war as companies look to establish operations in the country to avoid the tariff crossfire.
It will be negotiated over the coming year by senior ASEAN and Chinese officials and has not yet been released publicly.