Citizens of the states which are not part of the European Union or of the European Economic Area and wish to travel to Romania for a brief period of time, must obtain an entry visa in case they come from a State for which visas are required.
More details at http://igi.mai.gov.ro/detalii/pagina/en/Venireacalatoria-in-Romania/67
ANNEX 1 (http://igi.mai.gov.ro/api/media/userfiles/Anexa%20I%20Reg%20539.pdf)
The conference attendees from the RUSSIAN FEDERATION should apply for visa (according to the CE 539/2001 regulation).
You need a short-stay visa for scientific activities (marked C/ZA), that can be issued by the Romanian consular services in Moscow (http://www.mae.ro/en/romanian-missions/3222#783) or Sankt Petersburg (http://www.mae.ro/en/romanian-missions/3278#783).
The document required by the consular services is a written request from the host organization (http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=CELEX:22007A0517%2801%29:EN:HTML).
IFIN-HH will issue this document if the conference organizers are contacted at rolcg2016 at nipne dot ro.
ANNEX 2 (http://igi.mai.gov.ro/api/media/userfiles/Anexa%20II%20Reg%20539.pdf)
Some countries whose citizens are NOT required visa to enter Romania (according to the CE 539/2001 regulation):
- FYR of MACEDONIA (*)
- MOLDOVA (*)
- SERBIA [excluding holders of Serbian passports issued by the Serbian Coordination Directorate (in Serbian: Koordinaciona uprava)] (*)
(*) Exemptions from the visa requirement applies only to holders of biometric passports.