be on a collision course idiom
必然导致冲突;势必发生冲突
If two or more people or groups are on a collision course, they are doing or saying things that are certain to cause a serious disagreement or fight between them.
All attempts at diplomacy have broken down and the two states now appear to be on a collision course. 所有的外交努力都失败了，现在两国发生冲突似乎在所难免。