Ukraine's President Volodymyr Zelensky taking oathes during his inauguration ceremony at the parliament in Kiev.
The next parliamentary polls had been scheduled for October.
The fresh elections are expected within the next two months.
Ukraine's new president dismissed parliament and called a snap election just moments after being sworn into office on Monday. Mr Zelensky said they would be brought forward to July.
Zelensky does not command majority support in the current parliament.
Fulfilling a campaign promise, Zelenskiy announced a snap election to choose new lawmakers. Lawmakers have attempted to block these plans - last week, the governing coalition collapsed after a group of MPs from the People's Front pulled out.
Parliamentary rules prohibit it from being disbanded for 30 days after a coalition breaks up, a delay that would create another delay since it would mean the parliament would already be in the final six months of its a term, when it can not be dissolved.
Volodymyr Fesenko, head of the Kyiv -based think-tank Penta, said Zelenskiy's announcement shows "political will for radical change".
"The legally dubious decision to disband parliament will certainly be contested in court but Zelenskiy has shown that it is going to be him who will lay down the agenda and that he will dominate the political landscape". He ran on a platform promising to shake up Ukraine's politics, which most Ukrainians consider deeply corrupt and self-serving. Before disbanding parliament, the 41-year-old Zelenskiy upended other Ukrainian political traditions on inauguration day.
Tornadoes rake Southern Plains in U.S. ; more severe weather expected
However, the atmosphere will begin to lose some of the ingredients that are needed to have widespread intense severe weather. On Saturday, waves of severe thunderstorms struck the Southern Plains, bringing tornadoes , large hail and flooding rains.
Volodymyr Zelensky takes a selfie with his supporters as he walks to take the oath of office ahead of his inauguration ceremony in the parliament hall, in Kiev, Ukraine, May 20, 2019. All are allies of Zelenskiy's predecessor, Petro Poroshenko.
"The President has the authority [to dissolve parliament], but it's not clear he has the authority to do so at this time", Ambassador John Herbst, a former ambassador to Ukraine, told Newsweek.
Defence Minister Stepan Poltorak and the head of the SBU security service Vasyl Grytsak swiftly tendered their resignations.
Prime Minister Benjamin Netanyahu called to congratulate Zelensky after his win last month. That move would be largely symbolic because it would have to be approved by the parliament.
He urged ministers to also resign, despite Ukrainian law obliging the government to do so only after parliamentary elections.
"I'm ready to lose my position without hesitation so that peace will come - without losing our territory, never".
'We didn't start this war but it is up to us to end it, ' he said. "And for that, we need a parliament that functions".
In his speech, Zelensky referred to his background as a comedian.
"Throughout all of my life, I tried to do everything to make Ukrainians laugh", he said with a smile. "I am willing to hold a dialogue, but also convinced that the first step to open such a dialogue will be the return of all Ukrainian prisoners", he stressed.