If I say you can “have” “my” possessions, they were mine, but become yours. In this case, they apparently said “use” instead of “have”, but a lot of weapons and munitions are destroyed upon use, and those that aren’t are still being used in a war where it is very likely that they could be destroyed/lost/stolen anyway.
Tl;dr, no, they do not expect these weapons to be returned. They were “theirs”, and now they are Ukraine’s.
They’re only attacking Russia in the interest of defending their country. Russia could easily make this all stop.