The Russian semelfactive (event-minimizing) suffix 'nu' (e.g. pryg-nu-t’ = to jump once), rarely discussed in the rich literature on Slavic aspect, (Forsyth 1970, Fowler 1994, Borik 2002, Svenonius 2004a,b,c, Filip 2000, 2003, Romanova 2004, inter alia) presents an interesting problem as it shows a number of striking differences from other perfective operators and unexpected, previously unobser...