Squadron, Sprue, etc, etc, ship by many means, but none of them will ship paint and such via air anywhere, maybe it is just too much of a hassle for them to get special exemption of every parcel to be bothered with it, not sure.
I do know that Scale Finishes paint severely curtailed his international sales when those rules came into play, as he couldn't ship his paint. As a result I do the international shipping for him as CP still has surface shipping (for now), but maybe it is a case of him not knowing, too costly, or couldn't be bothered, but because of all of that, I was under the impression that it just couldn't be done anymore.
Makes no difference to me as I have a US address that anything originating in the US comes from, goes to, so no biggie to me. The difference in the cost of shipping of one order from Squadron, Stevens, etc, more than pays for the rental on the box, nevermind the asinine brokerage fees that Fed Ex and UPS charge.