Ukrainian citizens who were forcibly deported to Russia by invading forces are fleeing to Estonia, the ERR online media outlet reported on April 1.
The only transport links now operating between Russia and Estonia are bus services.
A member of the board of bus company Lux Express Rait Remmel, reports that many passengers on the Estonia-Russia route are citizens of more than one country.
He added that over 20% of passengers had recently been citizens of other states.
"For example, the number of Ukrainian refugees has increased," Remmel said.
"They arrived in Russia from Mariupol, and are going to Estonia via St. Petersburg."
As a rule, there are no problems with Ukrainians, apart from the fact that sometimes they do not have the proper documents, for example, they may have a copy of the document instead of a passport.
"In this case, we contact the Estonian Police and Border Guard Department in advance to find out if these people are allowed to cross the Estonian border," Remmel said.
Earlier Ukraine's Parliamentary Human Rights Commissioner Liudmyla Denisova announced that more than 400,000 Ukrainians had been forcibly deported to Russia since the start of the war.