"Through GoFundMe.org, this fundraiser will provide an immediate impact on refugee and humanitarian aid efforts. The fund will benefit Flexport.org and Airbnb.org, two organizations who are actively on the ground providing immediate help to those who need it most.
"Flexport.org is organising shipments of relief supplies to refugee sites in Poland, Romania, Hungary, Slovakia and Moldova.
"Airbnb.org is providing free, short-term housing to refugees fleeing Ukraine.
"We need your support to help Ukrainians. As a community, we are aiming to raise US$30 million dollars. Every donation, no matter the size, will make a difference in the lives of those affected. Please join us today by donating and sharing this fundraiser with your friends, family, and communities. We stand with Ukraine."
The married couple also shared a video via 44-year-old Ashton's Instagram, in which Mila admitted she is a "proud American" after moving to the country in 1991, but said "today I have never been more proud to be a Ukrainian".
Ashton added: "And I've never been more proud to be married to a Ukrainian."
The page has already raised more than US$3 million at the time of writing, largely thanks to a US$2.5 million donation made by the Ron Conway Family.
More than one million refugees have fled Ukraine since Russian president Vladimir Putin launched an invasion last week.