Hitler 's attack on russia , shortly after his pact with stalin , was a stunning demarche .
希特勒在与斯大林签约后不久进攻俄国，是一项令人震惊的政策变换。
They believed , probably correctly , that china was determined to conduct the test and that any preventive demarche would uselessly ruffle bilateral relations and perhaps reveal something about u. s.intelligence capabilities .
