Washington, Aug. 9 -- The Russia sanctions bill passed by the US Senate on Friday, which authorises tariffs of up to 100% on India, China and three other countries for buying Russian energy, faces three separate obstacles before it can reach Donald Trump for signature - the US House of Representatives is in recess until August 31, a possible September vote could collide with a Trump-Xi Jinping summit, and a coalition of House Democrats and at least one senior Republican are working to strip the tariff provisions altogether. The House timing alone leaves a narrow window. Members return from summer recess on August 31, break again through most of October and early November as they return to their districts to fight midterm elections on Novemb...