It depends. If there is no U.S. activity or connection with a U.S. trade or business whatsoever, then the foreign partnership probably does not have to file a Form 1065, and there are even exceptions income less than $20,000 if certain conditions are met. See 26 CFR § 1.6031(a)-1 - Return of partnership income for the rules on foreign partnerships.
Even if the partnership is not required to file Form 1065, the U.S. partners may be required to file Form 8865, Return of U.S. Persons With Respect to Certain Foreign Partnerships at this link and/or Form 8938, Statement of Specified Foreign Financial Assets.
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