The ex-politician accused Russian President Vladimir Putin of being "merely loopy" in eager to "come right here to kill Ukrainians" and vowed they might resist.
"We show a singular high quality that we will stand in opposition to Russian aggression," Mr Poroshenko informed CNN.
"Everyone ought to perceive, Putin declared a warfare not for Ukraine. Putin declared a warfare to the entire world."
Mr Poroshenko stated on the time his battalion is about two to 3 kilometres from the preventing between Russian and Ukrainian troopers.
He stated Ukraine wants the west's help, together with sanctions, kicking Russia out of SWIFT — a excessive safety messaging community that connects hundreds of economic establishments world wide — and blocking Russian planes and ships in EU and NATO ports.
Mr Poroshenko additionally thanked the United States and United Kingdom for offering defence weapons.
"That is vital for us that we really feel we're not alone, that you're along with us," he stated.
The previous President stated Putin won't ever seize Ukraine.
"Regardless of what number of troopers he kills, what number of missiles he has, what number of nuclear weapons he has, we Ukrainian[s] are free individuals with an important European future," he stated.
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Exterior of politics, Mr Poroshenko based the Roshen Confectionery Firm.
His success on this business earned him the nickname "chocolate king".
Nonetheless, throughout his time as President, the chocolate maker introduced plans to close its manufacturing unit in Russia for "financial and political causes" in 2017.
The corporate halted manufacturing at its manufacturing unit in Lipetsk and laid off its 700 staff, because it famous output had been falling due to Russian market restrictions and official stress.
Relations between the 2 ex-Soviet neighbours had been at a freezing level after Moscow's annexation of Ukraine's Crimean Peninsula and assist for a pro-Russian insurgency in japanese Ukraine.
The Related Press reported regardless of the tensions, Putin stated Roshen was welcome to maintain working.
Mr Poroshenko put the confectionery firm right into a belief the earlier yr, as he argued that it was tough to promote the asset amid an financial downturn.