Global arms trade deal takes effect

Enforcing the treaty will not be easy, as Russell Trott reports 

A global arms trade treaty regulating the multibillion-dollar business has come into force - a move hailed as "a new chapter" by UN chief Ban Ki-moon. 

He said he hoped the treaty would help prevent the transfer of weapons to "warlords, human rights abusers, terrorists and criminal organisations". 

The deal also bans arms supplies if this promotes war crimes or genocide. 

So far 60 nations have ratified the accord, but not the US - the world's top arms exporter. 

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