Dollar's share in trade payments among BRICS countries down to one third -- Lavrov / Lavrov says return to issue of single currency for BRICS possible once conditions in place / Brazil continues supporting expansion of BRICS trades in national currencies / 'De-dollar' diplomacy: Brics focus on alternative currency stirs Trump's ire / Financial infrastructure important for BRICS trade, economies -- Russian minister / BRICS currency: Is Trump's tariff threat justified? / Iran open to unified BRICS currency -- government / BRICS' GDP to account for more than half of world economy in 15 years -- Russian Deputy PM