The inflow of hard currency from the sale of oil will help the government pay salaries and revitalise Yemen's health care sector, experts say.
The Zainabiyoun Brigade is comprised of Pakistani Shias recruited by the Islamic Revolutionary Guard Corps to fight for its interests in Syria.
Iran has been arming the Houthis in violation of international resolutions, which undermines the militia's claims to be independent, experts say.
The actions of Iran's Islamic Revolutionary Guard Corps in Aleppo will exacerbate the region's sectarian divisions, experts say.
Lebanon's Hizbullah is providing specialised training to Yemen's Houthis with the support of Iran's Islamic Revolutionary Guard Corps, recent reports say.