No, the trade between the two countries is settled in foreign exchange. At present, the US dollar and the euro are international currencies, while the Japanese yen is a regional currency. The dollar is widely used in international trade.

For example, when China buys something from Russia, he first changes RMB into US dollars at the bank, then gives it to Russia, and then Russia changes US dollars into rubles at its own bank.

You don't have to trade with America. However, if the United States gives US dollars to China businessmen, China businessmen will change US dollars into RMB before they can use it at home. When he needs to do international trade again, he will change his RMB assets into dollars.