Chancellor's budget cuts a 'daunting situation for Wales'
Welsh ministers have criticised plans to ask some UK government departments to prepare for cuts of either 25% or 40% to their budgets by 2020.
Any reductions will be reflected in the Welsh government's budget, under a spending formula.
The UK government said Wales was "thriving" under "our long-term plan" and must contribute to the savings.
Commenting on Twitter, Welsh government Finance Minister Jane Hutt said it was "more bad news for Wales".