Mix together cream, sugar, and gelatin in a saucepan and heat gently until the gelatin is thoroughly dissolved. Cool until slightly thickened. Fold in sour cream and flavor with vanilla. Whisk until mixture is quite smooth. Pour mixture into a serving bowl or 3-cup metal mold. If you want to make individual servings, pour into 6 small half-cup individual molds. Cover and chill until set, at least 4 hours.
To un-mold, dip container in hot water until edges just begin to liquefy. Invert mold onto a serving dish and surround liberally with Strawberries Romanoff.
Wash and hull strawberries and toss with sugar. Put them in a bowl and pour over vodka, triple sec, and rum. Chill. When ready to serve, surround Russian Cream mold with marinated chilled strawberries.