Related Clues:

• Meltdown
• Cold War-to-detente transition
• Freeze follower, often
• Turn to slush
• Easing of tension
• Melt
• Microwave setting
• Turn to liquid
• Become less hostile
• Grow friendly
• Harbinger of spring
• Springtime occurrence
• Put in the defroster
• Deice
• Opening for peace talks