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ослабить напряжённость stresses
gen.	lessen the intensity of (чего-либо); relieve tensions (Anglophile); relax tension (Anglophile); slacken tension (Anglophile); ease tension (Anglophile); defuse tension (Anglophile)
Игорь Миг	deescalate tensions; mitigate tensions; defuse the tension
dipl.	reduce tensions; calm tensions; decrease tensions; defuse tensions; ease tensions; lessen tensions; relax tensions; slacken tensions
Makarov.	lessen the intensity of something (чего-либо); lessen tension; relieve strain
media.	break tension (bigmaxus); calm tension (bigmaxus); end tension (bigmaxus); cool tension (bigmaxus)
mil.	reduce tension

ослабить напряжённость: 10 phrases in 5 subjects

Business	1
Diplomacy	3
Foreign policy	1
General	2
Makarov	3