The Australian Federal Police has warned an Australian citizen to return items he says he collected from the MH17 crash site near the Ukraine-Russian border.

Key points: Demjin Doroschenko, one of the first on the crash scene, formed self-proclaimed MH17 Donbass Recovery Team

Demjin Doroschenko, one of the first on the crash scene, formed self-proclaimed MH17 Donbass Recovery Team He claimed he had already handed some items over to authorities in Kiev

He claimed he had already handed some items over to authorities in Kiev AFP says it has issued a warning to Doroschenko

First generation Australian-Ukrainian Demjin Doroschenko was in the region working as a freelance journalist when MH17 was shot down.

The 45-year-old said he was one of the first on scene and formed the self-proclaimed MH17 Donbass Recovery Team.

He said he collected pieces of evidence for "safekeeping and out of reach of the forces of the Russian Federation".

Demjin Doroschenko removed items from the MH17 crash site for safekeeping. ( ABC News )

"It needs to be rescued or otherwise the Russians will appropriate any other pieces that they can use in their case against the Joint Investigation Team [JIT]," he said.

He claimed he had already handed some items over to authorities in Kiev but still had possession of dozens more.

Doroschenko, who is still in Ukraine, said he recently offered the items to the AFP and the Dutch-led JIT, for a payment to cover transport costs.

The AFP said it was aware the personal belongings of Australian passengers had been taken from the site and it has issued a warning to Doroschenko.

"Items recovered from the MH17 crash site should not be used to obtain a profit or benefit," an AFP spokesman said.

"To do so only harms the families of victims who are looking for a resolution that could be provided by investigators having access to all of the crash site evidence.

"The AFP and JIT are aware that Mr Doroschenko may have visited the MH17 crash site and have provided him with a process of how he can provide those items to the JIT.

"Any criminal offences applicable to possession of property belonging to victims of MH17 (including Malaysia Airlines) will be the jurisdiction of Ukraine or Malaysia."

Doroschenko said he did not want to follow the return protocol as it involved handing items back to local mayors who he claimed were in collaboration with Russian forces.

One of the items he claims to have is a backpack belonging to Toowoomba victim Jill Guard, but he says he wanted to get it to the family.

A Guard family spokesman urged anyone with personal belongings to hand them back and asked for their privacy to be respected.

"Anyone trying to make a profit is not helpful and I encourage them to return items without any strings attached," the spokesman said.

In 2014 Doroschenko gave a firsthand account to ABC News about the civil unrest which unfolded in Kiev.