Crisis in Ukraine
President Obama on Sunday accused Russian President Vladimir Putin of not following the "letter or the spirit" of a ceasefire agreement between Ukraine and pro-Russian rebels.
"We're also very firm on the need to uphold core international principles," Obama said at the close of the G-20 summit in Australia. "One of those principles is that you don't invade other countries or finance proxies and support them in ways that break up a country that has mechanisms for democratic elections."
Under fire from other world leaders as well, Putin then left the meeting early, citing the long flight home.
"I need four hours sleep before I get back to work on Monday," Putin said. "We have completed our business."