By Huw Jones LONDON (Reuters) -Europe’s financial market on Monday began severing Russia’s ties to its critical plumbing for trading, clearing and settling securities as sanctions on Moscow started to bite. Euroclear in Brussels said it had closed its link to rival settlement house Clearstream Banking in Luxembourg for settling trades in Russian securities in response to European Union financial sanctions, following Russia’s invasion of Ukraine https://www.reuters.com/world/europe/russias-isolation-deepens-ukraine-resists-invasion-2022-02-28. Euroclear, owned by exchanges and banks, and Clears…