That's nice.
This is not a law-enforcement issue, so the Posse Comitatus act is irrelevant.
This is a quiet invasion by another nation.
From Article I, Section 8 of the US Constitution, a authorized function of the federal government:
"To provide for calling forth the Militia to ... repel Invasions;"
Agree. It has become a bit noisier lately. Unfortunately, Congress and the CIC won't call it an invasion.