Travelling with copic refills on a plane?

I've seen this question asked a few times but still no clear answer.

Has anyone brought refill ink on a plane? The copic site says it's okay to fly with markers but not ink, and in a different site they say it might be fine depends on the flight provider. I'm planning to buy refills from japan and bring them home so i'd really appreciate your input!

Also, do you know of any service that can ship the ink internationally?

thank you!