Four Schengen countries at the same time: Poland, Latvia, Lithuania and Estonia – 19 September stopped leave the Russians in the passport. With a short-term Type C Schengen visa across the external border of Estonia, Latvia, Lithuania and Poland, only Russian citizens traveling to close relatives and spouses in these specific countries can enter.
The Estonian government website says that Russians who have already entered the Schengen zone can visit Estonia.
“You can enter Estonia, regardless of the purpose of entry, from another Schengen country, such as Finland”, directly He says in explanations.
And there is a separate explanation on transit.
“Transit is only allowed if a Russian citizen transits through Estonia to reach his country of residence without stopping”, He says in explanations.