By Danilo Masoni MILAN (Reuters) – A Russia-exposed ETF rose by more than 100% in London on Thursday in a sign that some investors see current distressed levels as a potentially cheap entry point for Russian assets, even as the Ukraine crisis intensifies. Exchange traded funds (ETFs) remain one of the few ways left to gain exposure to Russia in the wake of Western sanctions against Moscow over its invasion of Ukraine, as they continue trading even if liquidity in the underlying asset dries up, although this makes it difficult to estimate the correct value. The Moscow bourse has been closed for…