LONDON German planes twice raided Scapa Flow of Britains fleet, damaging training: ship Iron Duke; four German planes reported shot down; British white paper asserts Hitler alone made decision for war. BERLIN D N B, German news agency, reports nazi plane attack on Scapa Flow, says one British warship hit by bombs, one British plane downed, one German plane missing. ISTANBUL Premier discloses Turkish Russian negotiations failed because soviet demands were contrary to Turkish security; reliable reports say Turkey to sign agreement with Britain. MOSCOW Turkish foreign minister leaves for home amid reports Turkish-Russian negotiations temporarily bogged down. German mission arrives for negotiations on renatriation of Germans in Baltic and Polish territory. PARIS French say sharp infantry engagements on western front, no change in positions. STOCKHOLM Heads of northern countries prepare for important conference on European troubles. HELSINKI Finlan looks to Stockholm conference for support in critical negotiations with Russia. WASHINGTON Russia assures President Roosevelt Soviets sole aim in Finnish talks was strengthening of friendly cooperation between two countries; neutrality bill debate continues.