Talks between the U.S. and China to resolve their year-long trade standoff appeared to be on life-support Monday, with Beijing struggling to respond to tweets by President Donald Trump that threaten an escalation of tariffs by the end of the week…

Trump on Sunday raised pressure on Beijing to strike a trade deal by announcing he would increase tariffs on $200 billion of Chinese imports Friday to 25 percent from 10 percent. He also floated the possibility of extending a new 25 percent duty on another $325 billion of imports not already covered…

“Risks of a full blown trade war are escalating,” Chua Hak Bin, a senior economist at Maybank Kim Eng Research Pte. in Singapore, said before the ministry’s announcement. “Trump’s threat may backfire as China will not want to negotiate with a gun pointing at their heads.”