Most western tanks have a frontal armour (turret) of more than 120 cm. IIRC the Leo 2a5 and above has about 150cm of frontal armor.
MZKT was a bit faster...
Its silly to say "this weapon will always defeat (or never) defeat that armor." In combat conditions, things are unpredictable. A hit might not totally penetrate into the fighting compartment but might shatter the ceramic/composite sandwich armor, therefore degrading its RHA rating, vehicle might have defects etc.
Comparing Kornet to Spire or Javelin is comparing apples and oranges. The Kornet is a low engagement cost laser beam rider while the other two are high engagement cost IR imager guided. Poland/Spain only ordered +-250 launchers and around 2500 missiles, which doesn't seem significant in the big picture.
Kornet is powerfu, because of its 150mm/7kg warhead which is comparable to TOW and aproaching that of the Hellfire (178mm/10kg.) I'm sure no tank crew would want to get shot at with one of these.
As for the RPG-29, I doubt it has any better penetration than western systems like Panzerfaust 3 etc, the rockets just fly faster so you have a better chance of hitting. These reloadable systems are heavy though, thats why most armies are going with disposable, one shot weapons.
Of interest is the presence of T-90s and BMP-3s. Does anybody know how prevalent the TOS-1 Buratino is in Russian units? I always thought it was a relatively specialised machine, but lately I've seen it almost in every video of army exercises (this one included)