UPDATE 1-British digital bank Monzo to announce imminent U.S. launch - source <div>* Monzo faces challenge of complex U.S. regulations (Adds comment, details)<div class="feedflare"> <a href="http://feeds.reuters.com/~ff/reuters/UKBankingFinancial?a=brQPk_SC89k:A1NzOE3DGmg:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/reuters/UKBankingFinancial?d=yIl2AUoC8zA" border="0"></a> <a href="http://feeds.reuters.com/~ff/reuters/UKBankingFinancial?a=brQPk_SC89k:A1NzOE3DGmg:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/reuters/UKBankingFinancial?i=brQPk_SC89k:A1NzOE3DGmg:V_sGLiPBpWU" border="0"></a> <a href="http://feeds.reuters.com/~ff/reuters/UKBankingFinancial?a=brQPk_SC89k:A1NzOE3DGmg:F7zBnMyn0Lo"><img src="http://feeds.feedburner.com/~ff/reuters/UKBankingFinancial?i=brQPk_SC89k:A1NzOE3DGmg:F7zBnMyn0Lo" border="0"></a> </div><img src="http://feeds.feedburner.com/~r/reuters/UKBankingFinancial/~4/brQPk_SC89k" height="1" width="1" alt=""></div> Posted by Reuters