Pour milk into a bowl. Sprinkle with the yeast and stir well. Allow to stand for 5 minutes.
Add sugar and buckwheat flour. Cover and allow to rise for 1 hour.
Add the eggs, sour cream, cream, salt and flour then stir until smooth. Cover and allow to rise for 2 hours.
Heat a small amount of oil in a frypan to a high temperature. For each blini fry 2-3 teaspoons of the batter in the frypan. When the batter looks dry and small bubbles are forming turn it over and brown the other side.
Cut salmon into thin strips. Garnish blinis with salmon strips, a drizzle of sour cream and sprinkle of dill.