"Over the past several years China has acted less like a 'responsible stakeholder' of the rules-based order of the Asia Pacific region and more like a bully," Senator John McCain, Chairman of the powerful Senate Armed Services Committee said during a Congressional hearing on the US Pacific Command.
China's increasingly assertive pattern of behaviour calls into serious question whether China's rise will, in fact, be peaceful, he said.
Despite US efforts to rebalance to the Asia Pacific, US policy has failed to adapt to the scale and velocity of the challenge being faced, he asserted.
"But after more than a year of this rhetoric, China's reclamation, infrastructure, construction and militarisation have all continued," he said.
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Last week there were press reports that China had deployed the HQ-9 surface-to-air missile system to Woody Island in the Paracel Islands.
"If true, this deployment would represent a blatant violation of Xi Jinping's September 2015 commitment to President Obama in the Rose Garden that China, quote, 'did not intend to pursue militarisation'," McCain alleged.
In his testimony, Admiral Harry Harris, Commander of the US Pacific Command said China views the South China Sea as a strategic frontline in their quest to dominate East Asia out to the Second Island Chain.
"Given China's economic rise, the goal may be natural; however, the lack of transparency on China's overall strategic intent behind its military investments and activities creates instability and regional anxiety," he said, adding Chinese actions are causing concerns among neighbours in the region.
intimidation and force they can bypass accepted methods of dispute resolution.
They have demonstrated this through aggressive artificial island building, and by growing a fleet of "white hull" ships and fishing vessels whose purpose is to dominate the area without the appearance of overt military force.
China is now turning its artificial island projects into operating bases for forward-staging military capabilities under the rubric of being civilian facilities, he said.
In a little over two years, China has constructed more than 3,000 acres of artificial land, heightening environmental concerns by destroying the fragile ecosystem of the South China Sea, he said.