"Had a great interaction with a delegation of senior members of the Communist Party of China led by (Politburo member) H.E. Mr Han Zheng," the Congress vice president wrote on micro-blogging site Twitter.
Besides Sonia and Rahul, the Congress delegation comprised former prime minister Manmohan Singh and senior leaders Karan Singh and Anand Sharma.
Han, Party Secretary of Shanghai and Member of the Politburo of the Communist Party of China, had called on Prime Minister Narendra Modi yesterday.