I've mentioned the global situation at 2.3-2.4 GHz a couple of times before.
At 3.4 GHz the situation is somewhat different. In ITU Region 1 only Germany, Israel and the UK have an amateur allocation (3400-3475 MHz) although other European amateurs working through CEPT have gained some access to 3400-3410 MHz. But the 3.4-3.6 GHz band has been earmarked for mobile wireless broadband expansion for some time. Our continued access to 3.3-3.5 GHz in the US is dependent upon military requirements continuing to trump commercial pressure.
Dave K1ZZ