Sept 14 (Reuters) - Russian retailer Magnit said on Thursday it had fully completed a deal to buy back blocked shares from Western investors at a 50% discount by purchasing shares held through Euroclear, the first such arrangement since Russia's February 2022 invasion of Ukraine.

The offer represented the first opportunity for non-resident shareholders of a Russian public company to dispose of their shareholdings with settlement in different currencies since sweeping Western sanctions over Moscow's invasion of Ukraine and subsequent Russian countermeasures restricted the flow of capital.

Magnit said it had bought back 21,903,163.8 shares from shareholders, representing about 21.5% of all issued and outstanding shares at an amount of around 48.5 billion roubles ($507.32 million). ($1 = 95.6000 roubles) (Reporting by Alexander Marrow Editing by Gareth Jones)