The propositional phrase in the sentence is Russia is the largest nation on earth.
<h3>What is a prepositional phrase?</h3>
A prepositional phrase is the part of the sentence that contain one preposition and the object it affects.
Some prepositional phrases are about, above, across, against, besides, by means of etc.
Thus, the propositional phrase in the sentence is Russia is the largest nation on earth.
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