A Move towards a detente began in the 70s and continued on (12h 37min, dec 22, 1970 y – 6h 51min, dec 8, 1979 y)
Added to timeline:
Date:
12h 37min, dec 22, 1970 y
6h 51min, dec 8, 1979 y
~ 8 years and 11 months