The provisional application of international treaties in not an unknown concept in practice, even if it is rather controversial, since it is based on extrapolation of consequences of an international treaty that is not yet in force and thus binding (either generally or on the specific state in question). Other important issues arise from the national law perspective, i.e. powers of the head of state and law-making bodies, relationship between international and national law.
In the Czech Republic, the regulation of the provisional application as a government decree insufficient to say at least.