"I have decided to terminate the powers of Verkhovna Rada (Ukraine's parliament) early," his official website quoted him as saying. "The new parliament will be elected on October 26, 2014."
The dissolution of Ukraine's parliament has been widely expected after the ruling coalition collapsed more than a month ago and Poroshenko promised on August 1 to hold new polls in the coming months, rather than in 2017.
The president on Monday also accused some politicians of supporting the pro-Russian rebellion in the east of the country, where over 2,200 people have been killed in the past four months.
"The current makeup of Verkhovna Rada supported (ousted former leader Viktor) Yanukovych," Poroshenko said, accusing politicians of passing "dictatorial" laws under the former Moscow-backed president.
The announcement came just hours ahead of talks with Russia's Vladimir Putin
...Second and fourth President and sixth of the Russian Federation and the first to remain sober. Putin is credited with bringing political stability and re-establishing something like the rule of law, which occasionally results in somebody dropping dead from polonium poisoning. Under Putin, a new group of business magnates controlling significant swathes of Russia's economy has emerged, all of whom have close personal ties to Putin. The old bunch, without close personal ties to Putin, are in jail or in exile or dead...in Minsk on Tuesday, where the two are expected to try to inch towards resolving the crisis.
Many politicians are "if not direct sponsors and accomplices, then supporters of the separatist bully boys" in eastern Ukraine, he said, adding that "snap parliament polls are part of my peace plan".
"I consider a victory in Donbass and a victory of the forces of democratic reform in Verkhovna Rada as a linked process," he said, referring to the popular name for Ukraine's eastern separatist strongholds of Donetsk and Lugansk.