Im just curious ,,,since the eastern catholic Bishop is out side of orthodoxy isn't he considered amongst the lay, and not a Bishop as far as orthodoxy is concerned....im i right or wrong on this.....? and once that is if he reunites with orthodoxy his ordination is accepted then and only then......or is there different thoughts on this in orthodoxy....stanislav
There is no doctrine either way on the grace of ordination outside of Orthodoxy.
There's a range of Orthodox opinion on the matter. Some have a view that mirrors Rome's of the Orthodox - 'such are bishops etc. only out of communion with us'; others see such clergy as laity.
I prefer to see the lack of defined doctrine on the matter as the humility of Orthodox bishops: they don't claim to be able to rule on something outside their church. Just like my take on venerating 'the other side's' post-schism saints: the bishops don't claim the power to rule on the holiness of people outside Orthodoxy so such saints can't be venerated in church but privately you may venerate anyone.
You're on the right track in that as long as Ukrainian Catholic bishops are outside of Orthodoxy, their orders aren't recognised in themselves.
The ways of receiving clergy and laity into Orthodoxy vary from baptism and ordination anew to a common approach for clergy in groups retaining a claim to apostolic succession and historically related to the Orthodox as the Ukrainian Catholics are. Often such are received into the ranks of the Orthodox clergy simply by a vesting ceremony.
As you put it in your question, if he reunites with Orthodoxy his ordination is accepted then and only then
P.S. Ukrainian Catholic canon law is essentially Roman Catholic canon law except in the Ukraine they may ordain married men.