Then / now

Then (April, 2009):

"So let me be clear: Iran's nuclear and ballistic missile activity poses a real threat, not just to the United States, but to Iran's neighbors and our allies. The Czech Republic and Poland have been courageous in agreeing to host a defense against these missiles. As long as the threat from Iran persists, we will go forward with a missile defense system that is cost-effective and proven. "

http://www.whitehouse.gov/the_press_office/Remarks-By-President-Barack-Obama-In-Prague-As-Delivered/

Now:

"President Barack Obama has decided to scrap plans for a U.S. missile defense shield in the Czech Republic and Poland that had deeply angered Russia, the Czech prime minister confirmed Thursday."

http://www.washingtonpost.com/wp-dyn/content/article/2009/09/17/AR2009091700639.html

But, don't call him a liar. And, trust what he says.