Swell.....you know its about time for another world war
So this is how they are going to meet their green-house gas emmissions targets
If you take a very close look (actual first person sources and NOT the versions found in various official textbooks) at The run up to World War II in BOTH Europe and the Pacific the ordering home of your nationals living overseas and unnecessary diplomatic staff were the first steps in warning other nations that things were headed in the wrong direction.
The next step will be the closure of all diplomatic post except the embassy in the national capitol
The next to last step is withdrawing your ambassador but leaving behind the chief of staff.
It will be the chief of staff’s duty to deliver the formal declaration of war. But, based on the historical background of both Russia and the US from World War 2 this might not happen - we were both attacked without warning.
It does look like that - minimize the number of potential hostages before hostilities.