Тиматик говорит, что:

National Russian Fed. (RU)
Destination Cambodia (KH)

Passport required.
- Passport and/or passport replacing documents must be valid
at least 4 months on arrival.

Visa Issuance:
Visa required, except for Nationals of Russian Fed. can obtain
a visa on arrival, for a max. stay of 30 days, provided:
For details, click here
- Holders of proof of being born in Cambodia issued to foreign
nationals living abroad can obtain a visa on arrival,
provided: For details, click here

Additional Information:

- Visitors are required to hold proof of sufficient funds to
cover their stay and documents required for their next
destination.

- Tourist visas may be issued in a passport or issued in an
e-Visa format, printed on a separate piece of paper.
Warning:
- Day trips (i.e., arriving and departing on the same day) to
Cambodia are not permitted.
- Except when arriving and departing in Phnom Penh (PNH).
- Except for alien residents of Cambodia.
- Except for holders of a multiple-entry business visa issued
by Cambodia.