Ministers from countries who lost citizens in the passenger jet shot down over Tehran last week have called on Iran to accept "full responsibility" and compensate the victims' families.
Foreign Secretary Dominic Raab met with his counterparts from Canada, Ukraine, Sweden and Afghanistan in central London on Thursday.
A statement issued by the ministers said they had agreed on five key demands to Iran.
This included a "thorough, independent and transparent international investigation", as well as demanding "accountability" for those responsible for downing the plane.
Iran admitted its military had accidentally shot down the Ukranian International Airlines plane after mistaking it as a "hostile target".
The incident came hours after Iran launched air strikes against Iraqi military bases housing British and American troops.
Speaking after the meeting, Canada's foreign minister Francois-Philippe Champagne said: "We are here to pursue closure, accountability, transparency and justice for the victims."
He said the "horrific tragedy" had produced "many, many questions" and that "families want answers".
"The world is waiting for those answers and we will not rest until we get them," Mr Champagne said.
Earlier, the ministers took part in a solemn candle lighting ceremony at Canada House in memory of those killed in the crash.
All 176 people, including four British nationals, on board the flight from Tehran to Kyiv were killed.
Cover Image: Wreckage of the Ukrainian passenger plane that crashed last week.