challenge: According to Javier Solana, head of the EU's Common Foreign and Security Policy, what is the challenge in implementing the classic rules of war in modern conflicts?
  
  A. The asymmetry between fighting parties, making it difficult to apply traditional rules
  B. The lack of clear definitions of war crimes in international law
  C. The increasing number of international observers on the ground
  D. The need for more severe punishments for war crimes
  Answer: 