Flight plans are usually filed 24 hrs in advanced with established commercial corridors are already well known with habitual flight numbers. So when the Soviets/Russians penetrate Alaskan ADIZ they would not be filing any flight plans, and of course we are well within intercept and escort procedures. If we are not alert, they would be free to penetrate national airspace. Free as in being non-escorted, not free as in given permission.
We do not control what the media say. Whatever beef you have with the media, take it up with them.
You obviously did not understand the Reuters news article, so I will try again...
1- If the intention is to enter national airspace, assuming peaceful intent, then a flight plan must be file at least 24 hrs in advance. Then as the aircraft enter the ADIZ and responded appropriately, he will be allowed entrance into national airspace.
2- If the intention is NOT to enter national airspace but the journey require passage thru an ADIZ, the only thing required is appropriate response and national colors. The aircraft will be monitored to ensure that what was claimed in the response will match.
The Chinese rules for this new ADIZ is that all passages must have filed flight plans REGARDLESS if the intent is passage thru the ADIZ or entering Chinese national airspace.
The Chinese rules stands contrary to accepted courtesies. Yes, there is nothing to say that China cannot make such a demand, but this is a such radical departure from accepted INTERNATIONAL courtesies that just about every neighbor of China took offense at it.