Attache is responsible for gathering and reporting information that might affect the interests of the nation. That often is the introduction about the measures to cope with the country's Government, irrespective of the.
Diplomats are responsible for collecting and reporting information that could affect national interests. Which often constitute a recommendation on measures to tackle the country's government.
A diplomat is collect and report information which may affect national interests. Which often is often an advice about the countermeasure to the government of the country.