Possible Clues:

• Former war zone offence by America
• Illegal activity covering area where conflict occurred
• Peninsula in the Ukraine
• Illegal act, source of acrimony for part of the Ukraine
• Where 1 and 7 were (and weren't) in charge
• Peninsula in today's Ukraine, site of an 1853-6 war
• Frost about to go all round peninsula
• Vice admiral's beginning in Black Sea region
• Unlawful acts by a Ukrainian republic
• Setting many on edge with each area of conflict