How do i get them and which ones are all available and with what conditions? I somehow got Viking Fury even through i only played Sweden a bit and just grinded it via VIDAR / CV9015 until ~9BR, however for my main Nations like Germany i grinded through properly the whole Tree i have no Badge nor for China with which i got like probably half of all my Matches while with Sweden i only ever really played with three Premiums until 9BR
You had to preorder a pack that came out that update iirc. If the pack is still on sale after the update has passed it is still possible to get them.
You have Viking Fury because you bought the CV90105, but you can get others from other premium packs. For example Wind of Change was available with the Merkava Mk.2D pack
Is there none for China or USSR because i also bought the ZTZ96A(P) for China and for USSR i got all three Premiums 2S38, T-80UD, T-72AV (TURMS-T)