Ukraine fell heir to the arsenals of the two Soviet Tank Armies pegged with 'defending' Europe - as well as some of the main armament production industries in the Soviet Union. They were, until their latest revolution, producing and servicing the Russian ICBM rocket fleet.  They still supply
 rocket motors for NASA. 

The dissidents armed themselves from the largest arms storage centre on Earth - in the salt mines under the eastern city of Slavyansk. 

Ukraine needs more weapons like it needs a hole in the head - not that those are lacking either.