Since the nuclear deal between the White House and Iran was officially completed and signed in July 2015, the Iranians have engaged in an number of alarming actions including the launch of ballistic missiles in violation of U.N. sanctions, the unlawful arrest and taking hostage of Americans in the country, threats of U.S. plane shoot downs while flying in international airspace, increased harassment of U.S. Navy ships in the Persian Gulf and detainment of U.S. sailors who were forced to make an apology, which was used as propaganda on Iranian state television.
Before the Iranian nuclear deal was agreed upon, critics repeatedly warned the deal being negotiated (and eventually signed) would only embolden Iran's bad behavior, not improve relations. Based on the evidence, it is clear Iran is emboldened, not deterred, and now the State Department is finally admitting the connection.