This question is still in the tourist environment a lot of disputes . The difference is due to the indistinctly submitted information on the website of the consulate . It says that citizens of the Russian Federation born on its territory can use the system of electronic permits . That is, strictly speaking, Tajikistan / USSR is not Russian citizens . I have quite a lot visas tourists with such passports . At the same time, the vast majority of tourists calmly travel with such pass orts with electronic visas and quietly crosses the border . As an option, in case of difficulties, you can call the senior shift and explain to him "how the USSR was falling apart" .

The electronic permission should be made out only born in territory of modern Russia. You need to apply for a visa at the Mexican Embassy.

BUT, as border guards, as a rule, can not read the inscription of Tajikistan in Cyrillic, you will be told that there will be no problems - fly.

I would make a visa for your place, for your own peace of mind. Now visa processing takes 10-12 working days.

In your case it is necessary to issue a regular multivisa at the consulate with the submission of a full package of documents for examination and questionnaires with fingerprints.