On Network 54 site at top of page is home for LGGS (Lithuanian Global Genealogical Society) site.
On this site is a links for LGGS. Click on this and scroll down to Lituanian Russian, Polish and Latin counterparts. Under Nicholas is a Lithuanian spelling of Mykolas. This site hasn't a counterpart for Michael.
We had a Motiejus who went by Mike in the US and a Tadas who went by Ted.