PHILADELPHIA, the United States, April 15 (Xinhua) -- Chinese Ambassador to the United States Cui Tiankai Sunday urged U.S. politicians and strategists to "make the right choice at the crossroads of history" for the world's most important bilateral relations.

The two countries have fallen into a trade dispute since January, with the U.S. slapping unreasonable tariffs on various Chinese commodities for exports, which aroused fears that the world's two largest economies would go into a trade war.

Cui pointed out the two countries have come to an important moment for making choices, as they will usher in the 40th anniversary of the establishment of diplomatic relations.

"I hope that American politicians and so-called strategists will not take the wrong direction, but make the right choices at the crossroads of history," Cui said in a speech at the 2018 Penn Wharton China Summit on Sunday.