He called on the US to exercise restraint in applying trade restriction measures.
He demanded Party members work to elevate the country to "a new level of economic development with new vitality."
He flagged that both sides could agree to an "ambitious and high quality deal" by the end of 2020.
He is also well-known for animation series Alps no Shojo Heidi (Heidi, Girl of the Alps) and Lupin Sansei (Lupin the Third).
He mentioned SAS also signed a deal but it was modest.
He made the remarks when meeting with Kim Jong-un, top leader of the Democratic People's Republic of Korea (DPRK) during his two-day visit to the country.
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He called for the country's political advisors and the departments handling proposals to strive together to promote a high-quality proposal process in the new era during a three-day symposium that began Wednesday in Beijing.
He made the remarks in response to a question about possible outcomes from a reported China visit by British Prime Minister Theresa May later this month, which will focus on trade issues.
He hopes that ICT will play a bigger role in areas such as increased investment attractiveness and improvement of people's lives.
He called on both sides to carry forward their friendly ties, strengthen strategic mutual trust, accommodate their respective core interests and major concerns, and expand practical cooperation in various areas.