The United Nations (UN) has to take firm action to enable the investigation team to enter the site where Malaysia Airlines (MAS) Flight MH17 had crashed, said Transport Minister Datuk Seri Liow Tiong Lai.

"The UN can no longer only use resolutions that have been passed, but with no action.

"We feel this (situation) cannot continue and something has to be done to enter the area," he added.

Liow said the Malaysian government was disappointed that the investigation team was still not able to enter the crash site, despite the UN having passed a resolution for the investigation team to do so.

"The time has come for the UN to take a firm action and I, the world, cannot rest because we have to find justice and the truth on who shot down MH17," he told reporters at a dinner in conjunction with MCA's 65th anniversary.

Liow said the UN should act fast to allow access to the MH17 crash site because it would be a last chance to retrieve the wreckage, as well as possible remains before winter set in.

The MH17 investigation team has yet to enter the crash site because the Ukrainian government could not guarantee them safe passage.

Flight MH17 crashed in eastern Ukraine on July 17 as it was flying from Amsterdam to Kuala Lumpur with 283 passengers and 15 crew on board. The Boeing 777-200 aircraft is believed to have been shot down over the troubled country.

In the recent development, Liow also announced that the remains of the last member of Tambi Jiee, the family of six who died in the tragedy have been identified.