Iran’s President Hassan Rouhani announced Sunday a “budget of resistance” against US sanctions targeting the country’s vital oil sector, backed by a $5 billion Russian investment. The US sanctions imposed last year in a bitter dispute centred on Iran’s nuclear programme include an embargo on the oil sector whose sales Washington aims to reduce to zero in a campaign of “maximum pressure”. Iran has suffered a sharp economic downturn, with a plummeting currency sending inflation skyrocketing and driving up import prices.