NATO says North Korea nuclear test is grave threat to world peace

What is a sentence that would be (on a scale from 0 to 5) a 2 out of 5 in terms of textual similarity to the above sentence?
North Korea's third test brings it closer to nuclear power status

it is a serious threat to international security.

What is a sentence that would be (on a scale from 0 to 5) a 2 out of 5 in terms of textual similarity to the above sentence?
russia said the system is a clear threat to russian security.

Egypt protesters defy cabinet threat

What is a sentence that would be (on a scale from 0 to 5) a 4 out of 5 in terms of textual similarity to the above sentence?
Egypt protesters defy cabinet threat to end sit-ins

Killer may have filmed France school shooting

What is a sentence that would be (on a scale from 0 to 5) a 3 out of 5 in terms of textual similarity to the above sentence?
Gunman may have filmed school massacre