US President-elect Donald Trump took to Twitter and attacked China anew on Sunday, accusing Beijing of currency manipulation and increasing its military aggression in the disputed South China Sea.

Trump's tweets further escalated tensions between Washington and Beijing after the Republican billionaire  broke decades-old foreign policy by taking a congratulatory phone call from Taiwan president Tsai-Lng-wen last Friday.

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"Did China ask us if it was OK to devalue their currency (making it hard for our companies to compete), heavily tax our products going into their country (the U.S. doesn't tax them) or to build a massive military complex in the middle of the South China Sea? I don't think so!" Trump tweeted.

Trump told his 16.6 million Twitter followers that he would not be dictated by Beijing on who he wants or does not want to talk as he brought up again his complaints and grievances on China that formed part of his winning presidential campaign.

Over the weekend, China has lodged 'solemn representations' with the US embassy complaining about Trump's total disregard for the decades-old diplomatic protocol by speaking directly to Taiwan president Tsai-Lng-wen.

Beijing considers Taiwan as a renegade province and has publicly and repeatedly declared that it would use force on the island should it push for independence.

Meanwhile, China has called on the US authorities to strictly adhere to the One China policy and deal with issues relating to Taiwan carefully. The US had broken diplomatic ties with Taiwan in 1979 and officially recognized China's communist government in Beijing.

China has kept the incident from becoming a full-blown crisis and has instead opted to file 'solemn representations' with the US and not a formal protest. 

TagsDonald Trump tweets, currency manipulation, South China Sea, One China policy, Taiwan, china, solemn representations, Taiwan president Tsai-Lng-wen, Chinese President Xi jinping