Modern Russian coinage...
1 kopek 1997-2009: 13/13 date (complete), ~20[1]/26 date+mint
5 kopek 1997-2009: 12/12[2] date (complete), ~22[1]/24 date+mint
10 kopek 1997-present: 18/18 date

, 33/33 date+mint (both complete)
50 kopek 1997-present: 16/16[4] date (complete), ~29/29 date+mint (probably complete, but I didn't check)
1 ruble 1997-present: 13/13 date, 23/23 date+mint (both complete)
2 ruble 1997-present: 12/12 date, 21/21[5] date+mint (both complete)
5 ruble 1997-present: 8/9 date, 14/15 date+mint (both complete up to 2012 - hadn't seen the 2013 coin yet)
10 ruble (non-commem) 2009-present: 5/5 date, 6/6 date+mint (both complete)
cumulative modern regular-issue Russian coinage: 97/98[6] date (only missing 2013 5 ruble); ~168/177[6] date+mint (missing a lot of early 2000s SP mint 1, 5, and possibly 50 kopek... and of course the 2013 5 ruble)
[1] I'll have to recheck - didn't do much of a count
[2] I'll have to recheck - I never seem to remember which combinations don't exist

for 10 and 50 kopek, 1, 2, and 5 ruble, "date" includes metal variety
[4] for 50 kopek, 1, 2, and 5 ruble, there are also dates with extremely small mintages and/or set-only; I prefer to ignore them
[5] that includes the 1999-M, which is rare enough that it would've been a key if not for the issues in [4]; so far I only ever found one of these in circulation
[6] if I didn't miscount
Anything else...
US
State Quarters (Delaware to Hawaii): probably complete ignoring mints, ~60/100 with mints
US wheat cents: ~30/whatever (I suspect I'm unlikely to get a complete set even by date, because 1922 is a semi-key and 1931-33 aren't much better)
US memorial cents: never got around to actually figuring out what I have, but a set of these is in my distant plans
"Russia" one-kopek denomination "type set", 1728-"present": 19/21, I think (if I didn't miscount, and ignoring anything I consider a pattern; the remaining two types - cloud and ring - are pretty darn rare and expensive, so I might not get them for quite a while)
"Russia" one-kopek denomination "type set", 1535-"present": 27/36 (again, if I didn't miscount; in addition to the above, I'm missing False Dmitry, Vasily, Vladislav, Michael, Alexey, Feodor III, and Ivan V, plus a few even rarer "types" I didn't count - of these only Michael, Vasily, and possibly Alexey might be anywhere near very common... already had a Michael piece but lost it, so tiny)
probably a few other "sets" I didn't remember
