The pro-Western president's first tour of the White House since his May election comes two days after Ukraine took its first firm step out of Russia's orbit by ratifying a landmark political and economic partnership pact with the 28-nation EU bloc.
But his ex-Soviet country's future remains uncertain in the wake of a five-month separatist uprising that left a wedge of the Russian-speaking east enjoying almost complete autonomy under the terms of a tenuous September 5 truce.
"I am proud that our European and trans-Atlantic partners understand that today, we are fighting not only for the territorial integrity and independence of Ukraine, but also for global security," Poroshenko told an international conference in Kiev on Friday.
"And for this, we need a new security strategy."
Also Read
The 48-year-old leader said he was "hoping in the very near future for a special status of a non-NATO member ally" that would compel the United States to spring into action should Ukraine come under attack.
"We are not going to be getting into a military excursion in Ukraine," Obama told US television just days after Russia completed its annexation of Ukraine's Black Sea peninsula of Crimea in March.
"We are not taking military action to solve the Ukrainian problem," he repeated during a late August briefing that coincided with NATO claims of Russia pushing tanks and paratroopers into the heart of the Ukrainian war zone.
Months of unrelenting US pressure saw the European Union -- mindful of imperilling its fragile economic recovery -- follow Washington's lead and unleash punishing sanctions on giant Russian banks and oil firms.