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China now ranks among the world's most advanced countries in some important fields in S&T development, Xi said.

Scientists should not be rushed for the sake of "making progress" and constrained by rigid systems, he said.

"The situation that our country is under others' control in core technologies of key fields has not changed fundamentally, and the country's S&T foundation remains weak," Xi said at a Monday S&T conference.

Both sides recognized that "intervention or involvement of parties not directly concerned could be counter-productive and further complicate the aforementioned differences."

Noting that Poland is an important cooperative partner of China in Central and Eastern Europe and in the European Union, the Chinese president said he and his Polish counterpart, Andrzej Duda, have decided to lift bilateral ties to a comprehensive strategic partnership.