Von Ribbentrop flew to Moscow the following morning, and after conversations with Stalin and Molotov put his signature to the non-aggression pact with the Soviet Union. A secret protocol divided Poland between them along the Narev, Vistula, San river line, declared Lithuania in the German sphere and the two northern Baltic states, Estonia and Latvia, in the Russian sphere as well as Finland and on the southern flank the Rumanian province of Bessarabia.