OSLO, NORWAY -- Officially, the Pentagon has no position on whether the Norwegian military should replace its aging fleet of P-3 Orions made by Lockheed Martin with Boeing's P-8 Poseidon surveillance aircraft. Unofficially? Multiple sources in government and industry say senior U.S. defense officials are encouraging a P-8 purchase of between five and six aircraft to better keep tabs on Russian naval movements. "The U.S. government would very much like to see Norway buy the P-8," a senior U.S. defense...