President Petro Poroshenko has called today's violence a "stab in the back."
"It was an anti-Ukrainian act for which all of its organizers without exception -- all representatives of political forces -- should be severely punished," Poroshenko said in a televised address.
More video from today's clashes.
Nationalists clashed with security personnel outside Ukraine's parliament as MPs backed controversial legislation granting more autonomy to pro-Russian rebels in the east of the country. Video shows tension before a National Guard soldier was killed by a grenade.
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Prime Minister Arseniy Yatsenyuk has called for a life sentence for the person who threw a grenade at law enforcement officers outside the Ukrainian parliament today.
“As a citizen of Ukraine I demand…life imprisonment for the person who threw a grenade, which resulted in the death of a conscripted member of the National Guard of Ukraine,” he said.
Yatsenyuk said that the cynicism of this crime lies in the fact that the “so-called pro-Ukrainian political parties” are trying to open a new front inside Ukraine.
“These political parties came not to protect the constitution, but to rape the constitution and Ukraine. They, in fact are worse than Russian bandits and terrorists in the East,” he said.
As a result of the clashes near the parliament today, 119 people were injured, according to Olha Bohomolets, an adviser to the president.
“One person is in a critical condition awaiting emergency surgery. On Hrushevskoho street four more ambulances are on duty,” she wrote on Facebook.
The far-right Svoboda party has blamed the government for clashes next to parliament today.
“It was the government, together with the pro-Russian Opposition Bloc, that provoked Ukrainians to protest, putting constitutional amendments that solidify the special status of Donbas and [represent an act of] capitulation to the Kremlin on the agenda and voting for them,” the party wrote in a statement.
It also claimed that law-enforcement officers were first to use force against the protesters, prompting a number of clashes.
“Law enforcement failed to take appropriate measures to neutralize the provocateurs," says the statement. "Obviously, the usage of an explosive device that an unknown threw at the police was a pre-planned provocation against Ukrainian patriots.”
Another angle on the grenade attack on the parliament, from RFE/RL's Ukrainian Service.
Verkhovna Rada Chairman Volodymyr Hroysman has urged an immediate investigation of today’s clash next to the parliament building.
According to a statement issued by the parliamentary press office, Hroysman called today’s incident “an act of terrorism.”
“Today, when the Ukrainian Parliament made important decisions that decentralize power, that don’t allow anybody to usurp power in Ukraine, a horrible act of terrorism took place next to the parliamentary walls,” he said.