The main guidelines on foreign policy:

The government certainly likes to observe these points along the lines of foreign policy:

• keep a cool stance on diplomacy, military cooperation (not including absolutely necessary military cooperation on defense) with countries having socialist governments
• not to rely on the principle of good will reciprocity with governments other than US, Canada and Japan, preferably purchasing services or access when required
  
• no weapon sales to countries, except non-sensitive components to US and Israel
• enter into agreements to most favorite foreign trade status not attached to political conditions
• avoidance of membership in international organizations
• no joining of international nuclear energy treaties since having no nuclear reactor breeder program
• distancing from any permanent diplomatic relations with Russia
• maintaining separation from Royal foreign policies (example here)
  

there are more, but I haven't found them to be clearly formulated