Section 28.4 - Permissible activities(a)General. Subject to the applicable approval process, if any, a national bank may engage in any activity in a foreign country that is:(1) Permissible for a national bank in the United States; and(2) Usual in connection with the business of banking in the country where it transacts business.(b)Additional activities. In addition to its general banking powers, a national bank may engage in any activity in a foreign country that is permissible under the FRB's Regulation K, 12 CFR part 211.(c)Foreign operations guarantees. A national bank may guarantee the deposits and other liabilities of its Edge corporations and Agreement corporations and of its corporate instrumentalities in foreign countries.