Russia, whose threat Nato exists to combat.
Does the NP "whose threat" have a grammatical case?
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I wonder whether it is in the objective case (as a direct object of the verb "to combat").
The given statement is not a complete sentence. "
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The given statement is not a complete sentence. It should be, for example: "Russia, whose threat NATO exists to combat, is still here." Then, in the complete sentence, the group of words, "whose threat NATO exists to combat", has an adjectival function and modifies "Russia."
tkacka15I wonder whether it is in the objective case (as a direct object of the verb "to combat").
Yes, that seems logical.
This is not a complete sentence. It would convert to "NATO exists to combat Russia's threat." "Whose" is a pronoun in the possessive case having "Russia" as antecedent. The object of the infinitive is "threat".