Vietnam visa for Russian citizens
Russia is in Vietnam visa exemption list so Vietnam tourist visa is not required if Russian visitors do not stay in Vietnam over 15 days. But if they do, the visa will be needed as regulated.
Requirements:
1. If you do not need a visa: a valid passport with at least 2 blank pages
2. If you do need a visa for a long trip:
Submit at: Vietnam Embassy in Russia
Processing time: 5 business days after the date of application submission

Vietnam visa on arrival
If applying for tourist visa to Vietnam at the embassy is inconvenient for you, Vietnam visa on arrival will be perfect alternative option since you can submit Vietnam visa application online in 2 steps only:
Once you have registered for the visa successfully, we will arrange you a visa approval letter (normally within 2 business days) to enter Vietnam and pick up the visa at arrival airport. The documents required for stamping process at the airport are:
After 5 or 10 minutes, the visa is ready for you to pick up.
Contact us via mail: vietnamvs.com@gmail.com if you have any question about Vietnam visa.