Using the Locations tab for your Google Shopping campaigns, you can quickly apply bid adjustments to control spend in desired regions.
Note that this can also be used to find issues in your general location targeting, wherein you may not be excluding territories you do not sell/ship to.
Start by clicking on the blue percent under the Bid Adj. column
Then select whether it is an increase or a decrease modifier
Apply the percent value to the modifier
Click Set to finalize
For one, you can add bid adjustments at a top level such as Country
By clicking on the blue name of the Country, you can further drill down to deeper levels such as State, City, and even Zip Code.
Simply keep clicking to reach your desired level and then apply your bid adjustments as described above.