Under the deal reached in November, Iran has expected to curb parts of its nuclear activities in return for a limited easing of international economic sanctions.
We have also imposed tough, calibrated sanctions on the socialist Maduro regime in Venezuela, which has brought a once thriving nation to the brink of total collapse.
The threat from the G7 comes just a day after both the United States and European Union unveiled sweeping sanctions targeting Russia's defense, energy and finance sectors.
China's Huawei launched its Harmony operating system for smartphones on Wednesday, looking to recover from U.S. sanctions that have hobbled its mobile business.