Financial assistance programme suspended until new PM and Cabinet are in place and economic policy discussions are held.
Jargaltulga Erdenebat and his 14-month-old administration told to step down over claims that $330mn of government contracts went to companies linked to ministers.
Halted consignments a blow to plans for diversification of volatile economy away from over-reliance on commodity exports.
The Western grip on Central Asian oil and gas flows is weakening, and half of the volumes could go east by 2020, according to the IEA.
Central Asian states are looking to balance Moscow and Beijing, rather than switch masters.