This is my first scenario that barely works, after working on it for a whole day non-stop.
A very adventurous scenario involved with border-intrusion, sneaking, and potential large scale air-to-air conflict. You can only play with 4 J-20 stealth fighters, without any support or backup. This scenario also feature the killer missiles that Herbert Carlisle second-guessed the Chinese aerial defense capabilities, and will be potentially used if a dangerous twist comes first.
The difficulty is high, require a very good timing and some flight plans to reach US bombers. It's not at war, so the dense air traffic is a part of the game.
Background:
US Air Force and Navy are assembling at Far-East region in recent years, to encounter several H-bomb detonation tests from North Korea. The US President signed the order to deploy additional bombers and warships to Japan, breaking the record since the Cold War, which is infuriated China and must seek for a harsh response before the US had gone too far.
And by aggravating Russia with islands disputes, US also agreed Japan to cruise a squadron of bombers alongside Sakhalin Oblast to reinforce the claim of those islands, which caused Russia strengthen the SAM defense with S-400 and additional fighters for encountering them.
This left PLAAF very little options to rebuff the US military deployments. Until a suggestion raised by the daredevil intelligence from Northern Strategic Region. PLAAF could commence an infiltration across Russian air space with cutting-edge stealth fighters from Harbin, and the new PL-15 AAM that spread fears in USAF commands. If those fighters could scramble US bombers without alerting Russia, the PR stunt will drastically favor to the Chinese military, and US will be the only one to blame.
However, Russia and China aren’t an official alliance, so the military access or support are out of question. If those stealth fighters are caught before answering the US, the repercussion will be disastrous. Hence, nobody can ensure this will be a ‘peaceful’ intercepting mission, so these jets are armed for an obvious reason.
Comment below for any bug, idea and question. Some content maybe placeholders and will take further changes.
Updated detail at new comments.