While Indian refiners are scrambling to understand the implications of President Trump’s threatened “penalties” on India for buying Russian oil, at least four tankers carrying crude cargoes from Russia were staying idle off India’s west coast on Friday, ship-tracking data compiled by Bloomberg show. Three of the four tankers are sanctioned by either the EU or the UK, or both, and had loaded at Russian ports in June. Now that they have arrived in India, the vessels are anchored off major oil import ports in western India…