SHANGHAI, May 28 (Reuters) - China’s blue-chip index ended higher on Monday, helped by robust gains in consumer and healthcare firms, and on signs the United States and North Korea were still working towards holding a summit. ** The blue-chip CSI300 index closed up 0.4 percent at 3,833.26, while the Shanghai Composite Index slipped 0.2 percent to 3,135.08 points. ** Sector performance was mixed on Monday. Gains were led by consumer and healthcare firms, with indexes tracking them ending up 3.3 percent and 2.3 percent, respectively. ** U.S. President Donald Trump said on Sunday a U.S. team had arrived in North Korea to prepare for a proposed summit between him and North Korean leader Kim Jong Un, which Trump pulled out of last week before reconsidering. ** Sentiment was also aided as worries eased over trade tensions between China and the United States, after Washington reached a deal to keep China’s ZTE in business. ** The Trump administration told lawmakers the U.S. government has reached a deal to put Chinese telecommunications company ZTE Corp back in business after it pays a significant fine and makes management changes, a senior congressional aide said on Friday. ** Chinese Vice President Wang Qishan said on Friday there would be no winners if there was a trade war between China and the United States, but said Beijing had to be ready for any turn of events. ** Investors also found solace after data showed profits earned by Chinese industrial firms in April rose at their fastest pace in six months.