JPMorgan sees cost inflation ruling miners' earnings in the second half of 2022, and expects Rio Tinto RIO.L, BHP BHP.AX and Vale to retain conservative guidance, and supply to remain tight in 2022. By Susan Mathew Jan 13 (Reuters) - Russia's rouble slumped 1% on Thursday, pressured by geopolitical tensions, while most Latin American currencies shrugged off early losses thanks to a weaker dollar. BRF signed a memorandum of understanding with Saudi Arabia's sovereign fund to create a joint venture to make poultry products in the Middle Eastern country.