PBOC moves in step with the U.S. Fed.

Fed tightening and Trump's trade threats top the list.

Central bank is switching gears after past stimulus steadied economy.

Hefty U.S. tariffs on Chinese goods would hurt world trade too.

BAT made $47 billion buyout offer for Reynolds in October.

Higher U.S. rates and the reset of Chinas annual FX quota loom large.

U.S. companies with more than $228B invested in China are likely to push back to protect their own interests.

China's currency weakened by capital outflows.