SALTI
| Date | Clue |
|---|---|
| 2019-12-29 | First of two U.S./U.S.S.R. pacts |
| 2015-06-19 | Nixon and Brezhnev signed it in '72 |
| 2015-02-21 | Pact signed by Nixon |
| 2013-11-01 | 1970s pact partly negotiated in Helsinki |
| 2011-05-12 | 1972 missile pact |
| 2009-08-07 | 1972 U.S./U.S.S.R. pact |
| 2007-10-22 | 1972 U.S./U.S.S.R. missile pact |