Forever Sets the Sun

Forever sets the sun is an almighty battle where the Allies defeated Tatsu. Meanwhile the Soviets secretly demonstrated their Treachery via abandoning them or attacking Mt Fuji where the Emperor is stationed at.

Hold out until the Soviets arrived
The Allies held off many Imperial Attacks and either completing their Bonus Objectives or refuse to do so.

Krukov and Cherdenko demonstrated their Treachery via tricking them they can't arrive.

Psionic Decimator Attack
"Looks like your friends have deserted you. Now then they will see you've lost."
 * Tatsu before the Psionic Decimator attack

After Tatsu told them they knew their Friends deserted them he used the Decimators to decimate the Allied Bases.

Only the Conyards or any unit far away from the bases Survived.

After the Attack Chronospheres appeared and after transporting an MCV across the area they got more funds to rebuilt or repair they have lost.

Destruction to Tatsus Fleet
"You primitive gaijin! How dare you attack Tokyo?!"
 * Tatsu upon arrival with his fleet

A Fleet arrived to defend Tokyo but got sunk.

Aftermath
With the Soviets murdered Yoshiro at MT Fuji and the Allies sunk Tatsus fleet and destroyed Tokyo the Empire of the Rising Sun had set.

Gregor Defected to the Allies and told them about Cherdenko and Krukov is attempting to get revenge against Ackermans superweapon.

Now the Allies knew that the Soviets ditched them in the first place. The Soviets used the Empire to distract the Allies and to attack the undefended Allied cities.

Hint
At the beginning of the mission players must first build as many units as they can. After the timer is close to the end sell all of their structures except the Conyard and any forces they built including Tanya must be kept far from the allied Bases until the Decimator attack is over. The player can also undeploy the MCV and move it far away if possible. The units do not get killed by the Decimator but will only have half their health.