Unfortunately the US continues to tax many savings vehicles used by foreign retirement accounts disadvantageously (PFIC rules). We are working on raising awareness of this unfair practice in Washington. In some of the recently negotiated Intergovernmental Agreements, like in Switzerland, many foreign retirement programs are exempted from FATCA reporting. In some, but not all, countries some form of similar treatment clause has already been incorporated into the Intergovernmental Agreement (IGAs) negotiations for 'qualified' plans. Ask your tax adviser if your plan 'qualifies' under the IGA for tax deferred/ advantaged treatment.
For helpful IRS information and links about foreign retirement plans
IRS Announces Efforts to Help U.S. Citizens Including Dual Citizens and Those with Foreign Retirement Plans
Information about Qualified Recognized Overseas Pension Scheme (QROPS)
Tax Traps For American Pension Savers
QROPS and America: Receiving right advice of paramount importance
USA Pension Transfer Information for Expats
QROPS USA: Difficult, but not impossible