Ceremonies were held in several countries Friday to mark one year since a Malaysia Airlines passenger jet exploded over Ukraine, killing all 298 people on board.
In Ukraine, President Petro Poroshenko called last year's downing of Malaysia Airlines flight MH17 a "ruthless terrorist attack" and said the fatal missile shot could only have happened with participation from Russia.
“This crime represents a threat to the whole international community. Justice has to be restored and the readiness to defend the basic values to be demonstrated. This is an act of atrocity that cannot be forgiven by anyone in the modern world," Poroshenko said.
In a statement Friday, he said Ukraine's "moral duty" to honor the victims is to ensure a fair punishment for those responsible for shooting down the aircraft, adding "the murderers should know that punishment is inevitable."
Poroshenko spoke by phone with U.S. Vice President Joe Biden Friday, with the two men agreeing on the importance and urgency of seeking justice for the downing of MH-17. The White House says Biden also pledged U.S. support for the joint efforts of Ukraine, the Netherlands, Malaysia, Australia and Belgium to seek justice in the case.
At the United Nations, U.S. Ambassador Samantha Power said the United States supports the implementation of Resolution 2166, which calls for a full and independent internal investigation into the downing of MH17. She urged the international community to ensure that those responsible are brought to justice.
Near crash site
On the one-year anniversary of the crash Friday, mourners for the 298 victims gathered in the Ukrainian village of Hrabove near the crash site in eastern Ukraine.
A makeshift memorial has been erected where many have come to pay their respects. Friday's ceremony will include the unveiling of a monument funded by the local rebel government.
While Ukraine blames pro-Russian rebels for shooting the plane down, Moscow and the rebels deny responsibility and blame Ukrainian forces.
A relative of the Australian victims of Malaysia Airlines Flight MH17 reacts during a service for the unveiling of a memorial outside Parliament House in Canberra, Australia, July 17, 2015.
In Canberra Friday, Prime Minister Tony Abbott recalled the “savagery” of the disaster as he unveiled a plaque set in soil from the place where the plane crashed.
Abbott told those at a memorial ceremony the victims' deaths leave “a void that can never filled and a pain that still throbs."
"Nothing that's said or done can bring them back, little can ease the grief that all who knew them still feel. Still, this national acknowledgment of that grief may be of some comfort to all who mourn," he said.
There were 38 Australian victims of the crash.
Video purportedly of crash site
Meanwhile, the Sydney Daily Telegraph newspaper has published online video showing what it said are pro-Russian rebel forces combing through the wreckage of the plane and discovering it is a commercial airliner rather than a Ukrainian military plane.
The newspaper said the footage was smuggled out of the rebels' base in Donetsk and obtained by the paper just this week.
On Thursday, Abbott said the video shows the crash "was an atrocity, it was in no way an accident." He accused the shooters of "reckless indifference" to the nature of their target.
Five countries with nationals involved in the disaster -- Australia, Belgium, Malaysia, the Netherlands and Ukraine -- have established a criminal probe of the crash and are expected to release a final report in October.
Reportedly, the ongoing probe points at a ground-to-air missile that was fired from a village under Russia-backed separatist control in eastern Ukraine.
International criminal tribunal
Those same nations have asked the U.N. to establish an international criminal tribunal to hold to account the parties responsible for the crash.
Russian President Vladimir Putin has said that establishing an international tribunal would be counterproductive.
The Kremlin issued a statement Thursday saying Putin made his comments in a telephone conversation with Prime Minister Mark Rutte of the Netherlands.
Many families of the victims also have gathered in the Netherlands, where the ill-fated flight originated.
The Dutch are leading an international criminal investigation into the crash that is to be completed by the end of this year.
The majority of the 298 people killed one year ago when the plane was hit over eastern Ukraine were Dutch citizens.
Steve Herman contributed to this report from Bangkok.