World War 3 Scenario?

OK Iran is tried of a Jewish state in the middle east and hears Israel killed more than a hundred Palestinians for protest and going a little crazy so Iran sends solders to fight the Jews the war starts with both countrys fighting the UN trys to stop them but then Egypt Lebanon and Syria join in but still cant take Israel down then they ask North Korea too help and end the fight so they do then South Korea comes to Israel aid but still isn't enough so Pakistan helps out the Arabs then India who has a grudge against Pakistan comes out to help Israel and South Korea the fight rages with no side winning until Iran threatens nuclear warfare when america hears this they go against the Arabs and North Korea the fight seem s to turn in Israel and America and there allies side when China tells the US to stop because it could interfere with there economy but the US refuses so China enters the war with the Arabs and North Korea America knowing China's mive army will be hard to take down so they ask for the European unions help so Great Britain France and Germany who are Europe's most powerful come to Americas aid and so does Japan need help the Arabs and China ask for Saudi Arabias help they say yes but they get Israel if they win the war after the fighting continues so side is winning so America asks for Spain Mexico and Canada's help they all agree to end the war but still isn't enough so both sides ask Russia for help but Russia doesn't know who to help so who do you think Russia would help and if any other countries would join the War