In the phone call today, Obama offered Poroshenko the United States' full support as the newly elected Ukrainian president works to unify his divided country.
Obama emphasized the need for quickly implementing reforms necessary for Ukraine "to bring the country together and to develop a sustainable economy, attractive investment climate, and transparent and accountable government that is responsive to the concerns and aspirations of all Ukrainians."
The two leaders agreed to continue their conversation next week when President Obama travels to Europe.
Poroshenko takes over as the government in Kyiv is facing armed separatists in eastern Ukraine who have rejected the results of the presidential election and are instead attempting to carve out pro-Russian autonomous regions.
RT @NSCPress: President Obama called President-elect Petro Poroshenko of #Ukraine today to congratulate him. Readout forthcoming.
— Geoffrey Pyatt (@GeoffPyatt) May 27, 2014
This was the scene inside #Donetsk's Kalinina hospital morgue after yesterday's fierce fight. Not for the squeamish. https://t.co/hhsA0W8mmn
— Christopher Miller (@ChristopherJM) May 27, 2014
By selling its natural gas to China at bargain-basement prices Russia is not mortgaging its future. It is mortgaging the future of Putin's Russia...
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So @CNN proved the open secret about Chechens in #Ukraine, but plausible deniability remains: "We're volunteers." | https://t.co/qYLXOU5kgE
— Matthew Kupfer (@Matthew_Kupfer) May 27, 2014
#Donetsk airport not reopen to flights until evening May 28 http://t.co/ifIxrlGIdI
— Kyiv Post (@KyivPost) May 27, 2014
Euronews: Beyond the barricades and battles in #Kyiv – the art of #Ukraine http://t.co/TFL4WyRi8Q pic.twitter.com/TmXVcbvSrI
— Kyiv Post (@KyivPost) May 27, 2014
A report from #Donetsk for @mashable: #Ukraine Government Claims Control of Airport After Deaths of 33 Separatists http://t.co/7jBkkuozZL
— Christopher Miller (@ChristopherJM) May 27, 2014
'We are from Chechnya, sent by Kadyrov': so-called #Donetsk rebels tell @CNN crew https://t.co/9UAi03hrhc
— Olga Tokariuk (@olgatokariuk) May 27, 2014