Chinese Vice Premier Liu He (first from right) and US Trade Representative Robert Lighthizer (first from left) at the trade negotiation in Washington DC on February 21, 2019 (Source: Xinhua/ VNA)

The two-day meeting between US Trade Representative Robert Lighthizer and Treasury Secretary Steven Mnuchin and China's top economic official Liu He is the first since China enacted new measures seen as concessions. The US and China have made progress on the core issues, but many problems remain.