Lagarde made the remarks Friday addressing St. Petersburg International Economic Forum.
US has to change its policies regarding Iran and Russia since its aim is not clear, she said.
She also referred to withdrawal of capital from developing countries because of US difficult monetary policies and creating obstacles by some countries in transferring goods and services as other problems of the world's economic system.
US President Donald Trump announced on May 8 that Washington would pull out of Iran nuclear deal and reinstate nuclear sanctions on Iran.
This is while most world powers including Russia, China, and European Union have repeatedly stressed that keeping the deal is in the interest of world peace and security.
Russian President Vladimir Putin also on Friday criticized President Donald Trump's decision to withdraw from Iran nuclear deal as an 'unconstructive' move.
'The United States holds presidential elections every four years, and if international documents are signed and revised every three to four years, what is the planning time-frame in such a mode of work? Zero,' he said, adding that it 'creates an atmosphere of nervousness and mistrust.'
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