Within the next six months, the United States Navy may need to decide whether to arm itself or Ukraine due to a reported weapons shortage.Weisberger tweeted that although the bulk of American weapons given to Ukraine are land weapons and not naval weapons, Del Toro's concerns are shared by others.His comments follow concerns expressed by James G. Stavridis, a retired U.S. Navy admiral who formerly served as the NATO supreme allied commander for Europe from 2009 to 2013, over the weekend.