中国实行独立自主的和平外交政策。 ✓
中国执行独立自主的和平外交政策。 ✗
杨寄洲 et al.,1700对近义词语用法对比, p.1514 (original)
The above example comes from a reference book which describes the differences and similarities between Chinese synonyms. It lists 政策 as a collocation for both...
CC-CEDICT: 实行 (shíxíng) to implement / to carry out / to put into practice
CC-CEDICT: 执行 (zhíxíng) to implement / to carry out / to execute / to run
So I don't see why 执行 is considered incorrect in the example above.
Question: In the above, why is 实行 correct, and 执行 incorrect?