Russia and Ukraine

[Leonardo17]

As far as I know, New Russian weapons like the Armada Tank, S-400’g, Su-57’s were not junk weapons at all. But they required western components and cannot be produced without them.

The Armata and SU-57 are both pretty much junk. The S-400 is a capable SAM, but the Armata shares the same design flaw that has launched the turrets of a thousand Russian tanks: the ammunition for the autoloader is stored at the bottom of the turret bustle. On top of that, they've only managed to build about 20 copies in the last nine years. Nine years, 20 tanks. Not nearly enough to make any difference on the battlefield.

The SU-57 is hyped as Russia's "stealth" fighter, but it's only stealthy from the front. It's incredibly maneuverable, but when your opponents can see you and kill you 50 miles away that doesn't matter so much, 'cause you ain't outmaneuvering modern missiles. Its sensor suite leaves a bit to be desired too. And to top it all off, they're only expecting the delivery of 22 copies by the end of 2024.

I found a good article on that. They just have 10 Su-57 now and they cannot produce more because it requires western components. The F-22 / F-35, J-20 are said to be “better” but the plane has many ingenuous aspects too. In fact Tom cruise is seen challenging two of those plane in Top-Gun Maverick (while being on board of a F-18 fighter jet from the 80’s – very convincing - ).
 

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I think these types of weapons are a sign of Russian creativity and remaining capacity to create advanced weapon systems. But like everything in Russia, this is completely mismanaged too.
 
Another issue is the price tag. The Su-57 costs about 50 million US $. It’s still cheaper than the F-35 (75 m $) and the (200 m $) and even the J-20 (210 m $). But I remember reading that this and all other Russian weapons where rather expensive for the results you get