*Iran welcomes int'l cooperation over Ukrainian plane crash: president

*Iran's IRGC accepts "responsibility" for crash of Ukrainian plane

*Iran says it "unintentionally" shot down the Ukrainian jetliner because of human error

*Iran admitting shooting down Ukrainian airliner an important step: Ukrainian PM

*January 9 is declared the day of national mourning in Ukraine

*Crash killed 176 people, mainly from Iran and Canada

*Airplane shootdown tragedies throughout history

TEHRAN -- Iranian President Hassan Rouhani said on Saturday that the country welcomes any international cooperation concerning Ukrainian plane crash, official IRNA news agency reported.

"Iran welcomes any international cooperation within the framework of international regulations which is aimed at clarifying dimensions of the incident," Rouhani made the remarks in a telephone conversation with Canadian Prime Minister Justin Trudeau.

He said that further investigation into the Ukrainian plane crash will be carried out to reach the final result.

In another phone talk with Ukraine President Volodymyr Zelensky, Rouhani said that "all those involved in the air disaster (of plane crash) will be brought to justice."

He said that the joint investigations between the Iranian and Ukrainian experts over the incident will continue and the judicial measures will "soon" start.

Xinhua