The eastern territory losses were facilitated by the Molotov-Ribbentrop German-Soviet non-aggression pact.

Entity and relation annotations:
id: 0
type: entity
value: text: the Molotov-Ribbentrop German-Soviet non-aggression pact
labels: <Regulation>
id: 1
type: entity
value: text: Molotov
labels: <Location>
id: 2
type: entity
value: text: Ribbentrop German
labels: <Location>