By Carolyn Cohn LONDON (Reuters) -BlackRock’s iShares will close its MSCI Russia and MSCI Eastern Europe exchange-traded funds, BlackRock said on Friday, joining several other funds which have shut their doors because of the Ukraine conflict. BlackRock had already suspended the funds in early March, shortly after Russia’s invasion of Ukraine, which Moscow calls a “special military operation”, on Feb 24. “Due to Russia’s invasion of Ukraine, normal market trading conditions have remained materially impaired, and a significant portion of Russian securities are still not currently tradeable for n…