Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
falsify [ˈfɔːlsɪfaɪ] vt фальсифици́ровать (impf/perf), подде́лывать (подде́лать perf)
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.
Русский: