where to buy USDT and BITCOIN cheapest via Western Union ore Cash payment in EUROPE ?
You have to do P2P trading with someone in order to buy Bitcoin or USDT and the best way in my knowledge is to use Binance if you prefer not to avoid KYC, if you are new to the crypto world and heard people saying either they should do KYC or not then you should also think about it for another second because KYC do matter.
In short, I will say by doing KYC you will expose your identity to the government indirectly, but if you don't do it then I don't think centralized exchanges can be used to track your cryptocurrency activities.
Coming back to your query, if choose to do KYC then Binance is a better option to buy BTC or USDT using Western Union or Ecash. If you are newbie then try to watch some tutorial from the YT it would help you more and try to watch new videos not some years old videos.