In terms of international trade, in the import and export trade of goods and services between euro zone countries and countries outside the region, the use of euro has increased sharply, and about 50% of foreign trade in the euro zone is settled in euros. In terms of the use of euro cash, the euro has successfully replaced the currencies of former EU member States in some neighboring countries of the EU. Statistics show that the euro cash circulation outside the euro zone is between 20 billion and 25 billion euros, accounting for 8% of the total euro circulation. In addition, in the process of euro cash conversion, the euro deposits of EU neighboring countries increased from 38 billion euros to 52 billion euros. Although the US dollar will remain the main international settlement currency in the foreign exchange market, oil and aircraft transactions for a long time, some oil-producing countries have also begun to try to switch to the euro for oil transactions. For example, Iraq switched to the euro, and Iran hopes to exchange oil for the euro, because nearly half of its imported products come from euro-zone countries.