As a US resident or citizen you have to report all income that you receive which includes this pension. On the upside you will also get credit for the foreign taxes that you paid. Also, because of this you'll have to paper file your tax return.
To start with you'll enter the pension amount as a substitute 1099-R. Go to the retirement income section of the wages and income section of your federal return. Click start next to the 1099-R button. Then, when it asks how this was reported, click the box for "I need to prepare a substitute 1099-R". Enter the information about the pension that you have available. Don't enter anything for federal income tax withheld since it was not US tax taken out.
Then you'll go to Deductions and credits and scroll down to 'Estimates and other taxes paid'. Click start next to 'Foreign Taxes'. Then enter the amount that you paid in foreign taxes on your pension. You'll receive a credit for that amount against any taxes you will owe for the pension in the US.
@Lembo
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