Ephraim feedeth on wind, and followeth after the east wind: he daily increaseth lies and desolation; and they do make a covenant with the Assyrians, and oil is carried into Egypt. Ephraim feedeth on wind - He forms and follows empty and unstable counsels.
Followeth after the east wind - They are not only empty, but dangerous and destructive. The east wind was, and still is, in all countries, a parching, wasting, injurious wind.
He daily increaseth lies - He promises himself safety from foreign alliances. He "made a covenant with the Assyrians," and sent a subsidy of "oil to Egypt." The latter abandoned him; the former oppressed him.