WASHINGTON (Reuters) - China is going to this week’s G-20 summit hoping for a deal to ease a damaging trade war with the United States, Beijing’s ambassador to Washington said on Tuesday, while warning of dire consequences if U.S. hardliners try to separate the world’s two largest economies.

Speaking to Reuters before heading to join Chinese President Xi Jinping’s delegation at the Group of 20 summit in Buenos Aires, Cui Tiankai said China and the United States had a shared responsibility to cooperate in the interests of the global economy.

Asked whether he thought hardliners in the White House were seeking to separate the closely linked U.S. and Chinese economies, Cui said he did not think it was possible or helpful to do so, adding: “I don’t know if people really realize the possible consequences - the impact, the negative impact - if there is such a decoupling.”

He drew parallels to the tariff wars of the 1930s among industrial countries, which contributed to a collapse of global trade and heightened tensions in the years before World War Two.

“The lessons of history are still there. In the last century, we had two world wars, and in between them, the Great Depression. I don’t think anybody should really try to have a repetition of history. These things should never happen again, so people have to act in a responsible way.”

Asked whether he thought the current tensions, which have seen the two sides impose tit-for-tat tariffs on hundreds of billions of dollars of goods, could degenerate into all-out conflict, Cui called the outcome “unimaginable” and the two countries should do everything to prevent it.

Cui said China did not want to have a trade war and sought a negotiated solution to the impasse stemming from U.S. President Donald Trump’s demands for far-reaching Chinese concessions to correct a $375 billion goods trade deficit with China.

“We are against any trade war,” the ambassador said, but added that China would “fight to safeguard our own interests.”

“We believe that the key to a negotiated solution to the trade issues is a balanced approach to the concerns of both sides and honestly so far I have not seen sufficient response from the U.S. side to our concerns.”

China's ambassador to the United States Cui Tiankai responds to reporters questions during an interview with Reuters in Washington, U.S., November 6, 2018. REUTERS/Jim Bourg

“We cannot accept that one side would put forward a number of demands and the other side just has to satisfy all these things.”

White House chief economist Larry Kudlow said on Tuesday that Trump was open to a trade deal with China but was prepared to hike tariffs on Chinese imports if there is no breakthrough on long-standing trade irritants during a planned dinner on Saturday in Buenos Aires with Xi.

TREASURY DEBT

Cui said he did not believe Beijing was seriously considering using its massive U.S. Treasury debt holdings as a trade war weapon, citing concerns that such a move would destabilize financial markets.

“This is very dangerous, this is like playing with fire,” he said when asked if China would consider selling Treasuries or reducing purchases should trade tensions worsen.

Trade and economic analysts have often said China could slow its purchases of U.S. Treasuries or sell off its holdings to pressure Washington into a deal.

China is the largest foreign holder of U.S. Treasury debt, with $1.15 trillion on Sept. 30, according to the latest Treasury data, compared with $1.19 trillion a year earlier. As of Monday, there was about $15.97 trillion of total public Treasury debt outstanding.

Cui said China’s Treasury holdings were a good example of the economic interdependence between the United States and China.

He said Trump and Xi had “a very good working relationship and personal friendship” formed in three previous face-to-face meetings, including two formal summits, and that had been shown by a long phone conversation in early November.

White House insiders say there remain substantial differences within the Trump administration over how far to push China.

The division groups on one side anti-China hardliner and trade adviser Peter Navarro, U.S. Trade Representative Robert Lighthizer and those who favor a complete re-evaluation of the relationship. On the other side are pragmatists led by Kudlow and Treasury Secretary Steven Mnuchin, concerned about the harm deepening friction could do to the U.S. economy and markets.