The issue is not simply cutting and running but the US abusing an agreement extending diplomatic immunity to spies and their dependents under SOFAS agreements. This is not diplomatic immunity sensu stricto.
The United States has been party to multilateral and bilateral agreements addressing the status of U.S. armed forces while present in a foreign country. These agreements, commonly referred to as Status of Forces Agreements (SOFAs), generally establish the framework under which U.S. military personnel operate in a foreign country, addressing how the domestic laws of the foreign jurisdiction shall be applied toward U.S. personnel while in that country.
Under similar circumstances the US has a history of leaning on countries to revoke diplomatic immunity in order to bring charges.

In the vernaciular you (the US)are taking the piss, and I do not like it.