Sri Lankan annual tea export income is approx : $1.5 B
Sri Lankan annual oil expenditure is approx : $3 B
Also ; due to the 70s petrodollar agreement; we can't exchange goods to gulf oils ( have to pay in $ )
But with Russia ; after the 2022 sanctions - they are not in the petro dollar system anymore. Now they do in Yuan and Rubel currencies.
BTW it's not practical to oil-tea exchange.
Oil market is highly volatile unlike tea.