Yes, according to the instructions for 3520: You are a U.S. person (including a U.S. owner) or an executor of the estate of a U.S. person who received, directly or indirectly, a distribution from a foreign trust during the current tax year; or you are a U.S. person who is a U.S. owner or beneficiary of a foreign trust and in the current tax year you or a U.S. person related to you received. A foreign pension is administered by a foreign trust account thus the distribution needs to be reported on a 3520.
There is also a 8938 requirement to file because a pension is a specified asset according to this IRS link. This needs to be reported if the amount of the pension exceeds $50,000 at any time during the year.
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