In the Moderation thread, include a box where the reporting nation must include the names of any nations who are being reported for whatever rule violation on the forum. The box would be pretty much like the recipients box labelled "To:" when composing a new telegram.
Upon submitting the report, the nations being reported would automatically get a telegram directing them to the thread of the report.
What is the benefit of this? Often reported nations have clearly crossed the line on the forum and must be dealt with by mod, sometimes however, someone might say something vague or harmless that can be misinterpreted by the reporting nation, and perhaps even misinterpreted by the mods themselves when examining the report. This can result in a nation punished when it shouldn't have.
A moderation report notification system however, will allow a chance for nations to explain themselves BEFORE the mods put the hammer down, or appeal the ruling ONLY incase they notice the report after the mods made their ruling.