The regulations of this part do not apply to payments to foreign governments, nor to checks or warrants issued in payment of salaries or wages, or for goods or services purchased by the Government of the United States in foreign countries, unless such payments are subject to the Foreign Funds Control Regulations (31 CFR part 520), the Foreign Assets Control Regulations (31 CFR part 500), the Cuban Assets Control Regulations (31 CFR part 515), or the Iranian Assets Control Regulations (31 CFR part 535).