WARSAW, Poland — Eastern European defense ministers said they hope the United States would deploy more troops on their soil, fearing the Pentagon could cut its military presence on NATO’s eastern flank. Simona Cojocaru, the state secretary at the Romanian Ministry of National Defence, said that “the United States’ military presence in Romania is the best deterrence” against Russia’s potential aggression. More defense “consolidation in the Black Sea” would send “a message to Russia, and a more