Russian economist Denis Astafiev has highlighted the significant risks associated with investing in cryptocurrencies, derivatives, and ICOs during periods of economic instability. According to Foresight News, Astafiev warned that the prices of crypto assets could experience substantial declines due to market fluctuations, regulatory risks, technological vulnerabilities, or decreased interest. He advised investors to limit their allocation to these highly volatile assets to between 5% and 10% of their total investment portfolio to avoid irreversible losses in extreme market conditions.