The UN needs to act? To do what? Historically they don't do much.
The United Nations has failed to prevent war and fulfill peacekeeping duties many times since its creation.
To name a few:
Rwanda in 1990 to 1994 - the worst ethnic genocides since World War II I believe. The UN did very little.
Cambodia 1975 to 1979
After the end of the Vietnam War and the Cambodian civil war in 1975, the Khmer Rouge regime took control of Cambodia and then carried out genocide killing two million people.The United Nations recognised the Khmer Rouge regime, and ignored human rights violations!
Iraq 2003-2011
More than one million Iraqis have died as a result of the conflict in their country since the west invaded. The UN attempted to legitimise it under the false assertion by the US and the UK that Saddam had Weapons of Mass Destruction.
Srebrenca
the UN failed both to demilitarise the Army of the Republic of Bosnia and Herzegovina and to force withdrawal. Town captured and a subsequent massacre.
It goes on
Syria
Kashmir
South Sudan
Yemen
Darfur
And many many more examples of UN failures into atrocities.
Honestly OP what do you want? Go on a plane and fix it yourself?