How to treat foreign taxes withheld from a rollover pre-tax IRA from which no distributions have been taken?

I finally noticed that my custodian's statements for my rollover IRA shows foreign taxes withheld, although I have taken no distributions.  This IRA came from my 401k which was pre-tax, and the IRA is supposed to keep it that way.  My investment adviser firm's fees are taken directly from the IRA by the adviser firm, and I understand those to not be subject to taxes.  I have gotten no tax forms of any kind that even list these foreign taxes; they only show up in the depths of the periodic statements from the custodian.  How should this be handled in Turbotax?  Are these taxes claimed as credits when I eventually do start taking distributions?  Do I need to do anything  in regards to these in my current tax forms before I actually start taking distributions?  What forms do I need from the custodian to support whatever is entered in Turbotax whenever I need to reference these taxes in Turbotax?