How would the Eastern Front of World War II had turned out had the Baltic countries not been invaded by the USSR in 1940?

Futurist

Ad Honoris
May 2014
18,742
SoCal
#1
How would the Eastern Front of World War II had turned out had the Baltic countries not been invaded by the USSR in 1939? As a part of the M-R Pact with Hitler, Stalin was allowed to invade and annex the Baltic countries in 1940. Then, when Hitler launched Operation Barbarossa, he expanded into the Baltic countries as well.

What if, for whatever reason, Stalin would have decided not to invade the Baltic countries in 1940? Would Hitler have been able to get some or all of these countries to abandon their neutrality and go to war with the USSR? Also, what effect would the neutrality of some or all of the Baltic countries have had on the Eastern Front of World War II--in regards to the front lines, et cetera?

Any thoughts on this?