Military-to-military co-operation with the US improves several Balkan countries' efforts to advance their defence systems and become NATO members.
Participants in foreign conflicts can receive jail sentences of at least five years.
The proposed law, which would be supported by a loan from the World Bank, is being considered by Parliament. In other business news: optimism grows for the economy's future in southeast Europe.
The British Embassy in Macedonia held training for 30 high-ranking officials in the security sector.
Political analysts expect the pro-European coalition will win the upcoming parliamentary election in Moldova.