However rumour is the Iskander launch vehicle can accommodate another type of missile ~ a long range ground launched kalibr variant with a range of 3400 miles putting it inside the INF bracket. It's supposed to called the 9M729 but no ones actually seen it and there's not much evidence it exists at all.

It's actually 2000km. A little over a dozen tests from Kasputin Yar since 2008; the first few tests were done with a fixed launcher (which was technically allowed under INF as a testing platform, ranging from 1300 to 2000km. However, from 2011 they were fired from the eventual TEL, which is a MZKT-7930 derivative called 9P701 (but they can be fired from regular Iskander TEL with minimal modification)--during these tests, Ru made very careful to limit the firing distance to 460km, but it wasn't much of a ruse as the telemetry signals determined it was the exact missile and several SIGINT intercepts up to Kremlin level determined otherwise (and they figured we wouldn't burn highly classified sourcing to definitively prove they broke treaty). In 2015 they again tested on fixed rails with the nuclear warhead version. In Dec 2016, they were assigned to first operational unit, 60th Missile Training Something-or-another, hence the designation of operational status as they are now in the hands of forces that are/will be qualified to use in combat scenario.

Source: "anonymous official" being a bad boy :)