Unless the Congress by law authorizes such action, neither the President nor any person or agency shall, on behalf of the United States, (a) subscribe to additional shares of stock of the Bank; (b) vote for or agree to any amendment of the agreement which increases the obligations of the United States, or which would change the purpose or functions of the Bank; or (c) make a loan or provide other financing to the Bank, except that funds for technical assistance note to exceed $1,000,000 in any one year may be provided to the Bank by a United States agency created pursuant to an Act of Congress which is authorized by law to provide funds to international organizations.