But he welcomes Moscow's involvement in diplomatic efforts to solve the crisis
President says US will continue working with Russia, UK, France, UN, others to ensure that process is 'verifiable'
Secretary of State John Kerry is heading to Geneva for talks with Russian Foreign Minister Sergey Lavrov about Syrian chemical weapons
In his address to nation, president referred to diplomatic developments of recent days as 'encouraging signs'
US president says Russian plan to put Assad's chemical weapons under international control could prevent military action
'No' vote could damage president’s political standing and US international prestige
President’s plan faces widespread opposition among lawmakers, American public
President says alleged use of chemical weapons has accelerated his process of deciding on a US response
Before emergency UN meeting, White House officials said they were 'deeply concerned' about report, which Syrian government denies
White House officials are considering possible responses to Egyptian interim government’s violent crackdown on protesters
Administration officials say they are continuing to review US policy of sending $1.5 billion a year to Cairo
Despite Thursday's suspension of joint military exercises, Obama refusing to cut $1.3 billion in US aid to Egypt's military
US president says traditional cooperation 'cannot continue as usual when civilians are being killed in the streets'
Taking with him burdens of the presidency and some inevitable criticism, Obama plans to be in Martha's Vineyard for eight days
US president meets with Greek Prime Minister Antonis Samaris at White House
Addressing marines, president says despite closing of US embassies due to terrorist threats, United States will never retreat from world
Press secretary says advisers discussing whether to go ahead with President Obama's meeting with Russian counterpart in September
President proposes compromise to help break legislative, political deadlock over his economic plans
Two leaders agree to help speed completion of Trans-Pacific Partnership, a free-trade agreement involving nations in Americas, Asia
US president says inequality of opportunity is morally wrong and bad economics
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