The commemoration, in presence of the Dutch king, comes as global investigators continue their painstaking probe aimed at bringing to justice those responsible for shooting down Flight 17 and killing all 298 passengers and crew.
"This insolent crime would not have happened if it were not for Russian aggression, a Russian installation and a Russian rocket brought from the territory of Russia", Poroshenko said in a statement.
Russian Federation has denied the accusations and denounced the investigation's findings as politically biased.
Investigators previous year said they had pinpointed 100 people they want to speak to who are believed to have been involved in transporting the Buk missile launcher or its use.
The Netherlands announced in early July that it would prosecute those involved in bringing the plane down.
The European Union foreign affairs chief, Federica Mogherini, called for global co-operation in the hunt for the perpetrators.
"That calls on all states to cooperate to ensure that those responsible for the killing are brought to justice", she told the Australian Broadcasting Corporation.
The so-called "forest monument", designed by Dutch landscape artist Ronald Westerhuis, is also surrounded by sunflowers, which the memorial website says "refer to the sunflower fields in eastern Ukraine where some parts of the plane wreckage were found".
Ms Bishop said "every legal avenue" was being pursued, and urged Russian Federation to comply with UN Security Council resolution 2166, authored by Australia. It is also noted that the question of the Dutch DSB conflict on the heights, the Russian side did not provide an answer.
The new commemorative site there features 298 trees - one for each victim - planted to form a "green ribbon" around a four-metre-tall steel wall.
Flags are half-mast prior to the revealing of the National Monument for the MH17 victims.
Three years have passed since Malaysia Airlines Flight 17 was shot down, and the case is coming closer to court.
Though most of those killed were Dutch, there were people of 17 other nationalities on board the Malaysia Airlines flight, including Australians, Britons, Malaysians and Indonesians.
In Kiev, Ukrainian President Petro Poroshenko today insisted Moscow must be held to account over the tragedy.
"I am convinced that the impartiality of the Dutch justice will complete this path".
In Malaysia, Transport Minister Liow Tiong Lai promised justice for the victims and said that July 17, 2014 "will always be in our memory".