"China will take decisive actions to protect its sovereignty and security interests, and we will make our words a reality," Yang said on Thursday, as quoted by the Chinese Foreign Ministry.
According to the diplomat, Washington has made a series of "incorrect actions and statements interfering in China's internal affairs and damaging its national interests."
The Taiwan issue is the most sensitive and important in China-US relations, Yang specified. He said that if Washington continues to play the so-called Taiwan card and keeps going down the "wrong path," it will inevitably result in the emergence of a "dangerous situation."
"We urge the US to clearly understand the situation, strictly honour its own commitments, and respect the One China principle and the three joint China-US communiques," Yang said.
Beijing considers Taiwan an unalienable part of its sovereign territory and opposes any official contacts between the island and other countries. The US has supported pro-independence forces in Taiwan and sold the island weapons.