Time to read the Nobel speech again.

[Tx4obama]

3. I don't have all the links. But some info below

'Senator' Obama worked with Senator Lugar regarding nuclear proliferation - before he was president.

-snip-

President Barack Obama has taken an interest in safeguarding nuclear materials since at least his first year in the Senate. Obama's first foreign travel as a U.S. senator was with Republican Sen. Richard Lugar of Indiana in August 2005, when the two men visited nuclear weapons storage and dismantlement facilities in Russia, Ukraine and Azerbaijan.

The next spring, Lugar and Obama authored a Senate bill authorizing a program to provide assistance to foreign countries to prevent the proliferation of weapons of mass destruction. The bill's provisions were incorporated into a House bill that passed later that year. It was signed in January 2007.

The Lugar-Obama initiative is modeled after a 1991 bill authored by Lugar and former Democratic Sen. Sam Nunn of Georgia. The Nunn-Lugar program provided U.S. funding and expertise to the former Soviet Union to dismantle stockpiles of nuclear, chemical and biological weapons

-snip-

Full article/updates here: http://www.politifact.com/truth-o-meter/promises/obameter/promise/382/secure-nuclear-weapons-materials-in-four-years/

And Rachel Maddow has done two or three segments/videos over the past several years regarding nuclear material that was rounded up in several countries and moved due to Obama's efforts.

Some more info here: http://www.politifact.com/truth-o-meter/article/2012/dec/03/has-obama-reduced-nuclear-threat/
See the article and also the center column section where it says Related...