An untested Trump may add friction

US president-elect makes accusation on Twitter after drone issue resolved

US president-elect Donald Trump's inexperience in diplomacy - demonstrated over the weekend after the Chinese Navy's seizure and return of an unmanned US drone in the South China Sea - might lead to more confrontations between China and the US as well as fissures between the US and its allies, Chinese experts on international studies warned.

Trump, whose inauguration is five weeks away, took the drone issue to Twitter on Saturday, accusing Beijing of "stealing" the equipment in an "unprecedented act".