THE HAGUE — International investigators are on Wednesday expected to announce charges against several suspects in the shooting down of flight MH17 over eastern Ukraine five years ago in an attack which killed all 298 people on board.

The Dutch-led probe has said it will first inform families, and then hold a press conference to unveil "developments in the criminal investigation" into the downing of the Malaysia Airlines Boeing 777.

The breakthrough comes nearly a year after the investigators said that the BUK missile which hit the plane had originated from a Russian military brigade based in the southwestern city of Kursk.

The airliner travelling between Amsterdam and Kuala Lumpur was torn apart in mid-air on July 17, 2014 over territory in eastern Ukraine held by pro-Russian separatists.

Ukraine's deputy foreign minister Olena Zerkal told Interfax-Ukraine news agency on Tuesday that four people would be named over MH17, including senior Russian army officers.

"The names will be announced. Charges will be brought, Zerkal said, adding that a Dutch court would then "start working to consider this case".

Zerkal added that the transfer of weapons like the BUK anti-aircraft missile system "is impossible without the (Russian) top brass's permission" and said others would have been involved beyond those being charged.

'First step to trial'

The Joint Investigation Team (JIT) probing the attack -- which includes Australia, Belgium, Malaysia, the Netherlands and Ukraine -- has declined to confirm that it will announce charges.

The Netherlands and Australia said last May that they formally "hold Russia responsible" for the disaster, after the findings on the origin of the missile were announced. Of the passengers who died, 196 were Dutch and 38 were Australian.

Moscow has vehemently denied all involvement.

Dutch broadcaster RTL, quoting anonymous sources, said the suspects could be tried in absentia as Russia does not extradite its nationals for prosecution.

"I expect there will be important new information. That means the inquiry is advancing," Piet Ploeg, president of a Dutch victims' association who lost three family members on MH17, was quoted as saying by broadcaster NOS on Friday.

"It's the first step to a trial."

Investigative website Bellingcat said separately it will also name "individuals linked to the downing of MH17" on Wednesday. It said its reporting was "totally independent and separate from the JIT's investigation". — AFP