Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
ignore [ɪgˈnɔːr] vt (pay no attention to) игнори́ровать*(impf/perf) (fail to take into account) упуска́ть (упусти́ть*perf) из ви́ду
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.