Ironically what the crisis needs now is a smoking gun - quite literally.
Whilst America has stopped short of specifically blaming Russia for the loss of nearly 300 lives on flight MH17, it has accused Moscow of fomenting the turmoil in the region.
President Obama and other world leaders are holding fire until they have absolute proof that separatists fired missiles given to them by President Putin.
And that's why this is so complex diplomatically.
The separatists deny firing at the Malaysia Airlines plane and Russia says Ukraine is responsible for the tragedy by ramping up its attempts to wipe out the rebels in the east of the country.
And until there is real proof this crisis will remain a murky mess.
Unless the international community takes bold steps which go beyond sanctions against President Putin, convinced his hands have blood on them, there will be no justice.
It would seem that President Putin is playing the defiant innocent, he won't even admit backing the separatists of eastern Ukraine.
Russia is accused of supplying pro-Russian rebels in Ukraine Weeks of strident anti-Ukraine propaganda have now been replaced now by unusual silence for one so bullish and vocal.
This is the biggest crisis between East and West since the end of the Cold War.
But if the West is to truly act decisively then it needs proof of who fired the missiles and that will come from a full investigation of the crime scene – and that appears to be being hampered by the rebels.
Representatives from the OSCE (Organisation for Security and Co-operation in Europe) have been denied access to the crash sight.
There are reports of looting and that raises question marks about whether it will be too late by the time international investigators are given full control of the scene.
The US says it will wait for the facts about what has happened, but it can't wait too long for fear of being accused of letting down the victims of and their families.
The downing of a passenger jet – whether accidental or deliberate – is like a bad dream.
But if Moscow's fingermarks are found on the missiles then what may follow is the stuff of nightmares.
The question is whether Russia will step away from the rebels, settling instead for its gains in Crimea. If it does a serious diplomatic crisis can be averted.
Israeli airstrikes in Gaza have continued into a 12th day 
Security monitors speak to a separatist at the crash scene
The debris was scattered over a wide area
A children's toy lies among the passengers' possessions
British victims Richard Mayne, Ben Pocock, Glenn Thomas and Liam Sweeney
Smoke billows in Gaza after an air strike on Friday
Sgt Eitan Barak, killed in fighting overnight. Pic: Israeli Defence Force
Those injured in explosions and fighting are arriving at hospitals in Gaza
An Israeli mobile artillery unit fires towards the Gaza Strip
Israel's anti-missile defence system in action on Friday
Israeli troops crossed the border into Gaza overnight
A deserted street in Gaza as Israeli forces continue their ground operation
Palestinian authorities say the majority of casualties are civilians
An emergency worker at the scene of the crash
Glenn Thomas was among the victims of the tragedy
Flames rise from wreckage of the Malaysia Airlines jet 
Flight MH17 taking off at Schiphol Airport in the Netherlands
The last known location of flight MH17
Armed Russian separatists inspect the wreckage
The wreckage was scattered over a wide area
A distressed woman waits for information in Kuala Lumpur
Mr Obama announces fresh wave of sanctions
The mouth of the Hamas tunnel spotted by Israeli forces
An Israeli cannon fires artillery shells into Gaza on Thursday morning
A home Palestinians say was destroyed by an Israeli strike before the truce
Gaza City (foreground) and the Israeli city of Ashkelon (background)
Four children were killed in an Israeli strike on a Gaza beach on Wednesday
People carry their belongings among building debris in Gaza
Leaflets were dropped warning of IDF strikes in Gaza
Israel's Prime Minister Benjamin Netanyahu 
More than 100 people were taken to hospital
Some people escaped with relatively minor injuries
There were reports of a few people still trapped in the wreckage
Helicopters rushed the most serious casualties to hopsital
Mr Mortimer pictured with Nelson Mandela. Pic: Antoine de Ras
South African newspaper front pages feature stories on the altercation
Reeva Steenkamp was shot dead on Valentine's Day 2013
The athlete posted these images on his Twitter account
Pistorius shot Reeva four times through a toilet door
His last tweet contained a prayer about those living in pain
Artillery flares illuminate the sky following an Israeli airstrike in Gaza
A picture tweeted by Israel claiming to target a militant rocket site
Tel Aviv residents take cover during an air raid siren warning of an attack
Israeli soldiers rest in the shade of trees near central Gaza
Israeli soldiers walk across a field near central Gaza strip