Yes and no. Like railroads, communications are not generally an integrated single-corporation tree, they thread through each other's servers, towers, and switches, any one of which can be the subject of a warrant. The fact that a foreign corporation is involved does not preclude the DOJ from getting hold of the data or info, it just means that once they have a US warrant, they also need to get a supplementary warrant in the corporation's country, which might be easy or hard. Our DOJ can wildly overstate its basis for the warrant or outright lie about it just as easily to a foreign law enforcement partner as it does to the FISA court. And finally, Commonwealth countries have rather different standards on privacy and warrants than we do, generally being lower, which is after all why we have the Third, Fourth, and Fifth Amendments.