Ukraine's President vows to defend territory 'no matter what'

"I don't want war. I don't want revenge," Petro Poroshenko said after taking the oath of office. But then his talk turned tough.

He promised to meet anyone challenging Ukraine's territorial integrity with military might. Alluding to a Biblical verse he said, "Who comes with the sword will fall from the sword."

The statement was met with enthusiastic applause.

The country will build the means to do so, Poroshenko said, and re-arming the Ukrainian army must be a priority. "No one will protect us, if we do not learn to protect ourselves."

He called for separatists in Ukraine's east who have taken up arms against the government to lay them down and offered amnesty to those who "do not have blood on their hands."

Poroshenko also called for corridors to open to allow fighters who have joined pro-Russia separatist forces from outside the country to leave Ukraine.

And he made it clear he would not negotiate with those who fought against the government. "Talking to gangsters and to killers is not our avenue," he said.

Heading West

Poroshenko, one of the world's richest men and an experienced politician, took the oath of office in the country's parliament Saturday.

He was presented with the symbols of high office -- a presidential badge, a seal and a mace -- before taking to the podium for his inaugural address.

His opening remarks left little doubt over the tenor of his speech, as he praised the activists of the Maidan, whose rebellion in the center of Kiev led to the ouster of his predecessor in office, Viktor Yanukovych.

The pro-Russia former President sparked rage from Ukrainians who wanted the country to join the European Union when he nixed an agreement with the EU in favor of closer ties to Moscow.

Ensuing street battles resulted in the deaths of dozens.

Poroshenko condemned the former pro-Russia government as a "dictatorship."

"The people stood up," he said, declaring his country's new direction toward the West.

Before at least four European Presidents and U.S. Vice President Joe Biden, the man who became a billionaire as a chocolate maker vowed to quickly continue Ukraine's move toward the EU, calling Ukraine's path to Europe "irreversible."

Ukraine's natural place is with Europe, he said, adding that he's prepared to sign an economic partnership agreement with the European Union as soon as its officials approve it.

The agreement is just one step toward Ukraine becoming a member of the European Union. Poroshenko received a standing ovation for the remark.

Ukrainians have reason to look forward to a brighter future, he said. "We are being supported by the whole world."

Armed conflict

But the new President inherits a country with a burgeoning armed conflict in its east.

Violence there is taking lives daily, and government troops and rebel fighters are beefing up their might.

The names of the cities Donetsk and Luhansk have transformed into monikers for flashpoints of tension between Russia and the West as the government in Kiev breaks its ties with Moscow to embrace Europe and the United States.

But ethnic Russian separatists in the east and south yearn to stay with Moscow. The Kremlin, holding fast to centuries-old ties, is said to be helping them dig in their heels after annexing the region of Crimea, which before 1954 was part of Russia.

Poroshenko addressed the move directly. The territorial integrity of Ukraine is not up for discussion, he said, and he has taken an oath to uphold it.

"I will stand by this oath no matter what," he said.

He promised to visit Luhansk and Donetsk and maintain respect for the Russian language, commonly spoken in Ukraine's east and south.

The government will be decentralized, giving those regions more say in their own affairs, he said.

"New powers will be allocated to regional powers," Poroshenko said.

But there will be no federalization, as many separatists have demanded. Some analysts believe such a move would help cement Russia's influence in their regions.

Ukraine will be one unified country, the President said.

Meeting Putin

Security prospects have seemed elusive, but on Friday, a ray of hope pierced the ominous clouds between Moscow and Kiev during D-Day celebrations in France, where Russian President Vladimir Putin came together with Western leaders to honor common sacrifices made to defeat fascism in World War II.

Putin came face-to-face with Poroshenko.

Afterward, Poroshenko announced that negotiations between the two sides would begin Sunday, his second day in office.

"A representative of the Russian Federation will come to Ukraine to discuss the first steps as to peaceful resolution of the situation," spokeswoman Irina Friz quoted the President as saying on Friday.

Russia is to cooperate with Kiev to close border crossings, Poroshenko said.

Foreign fighters may have crossed into Ukraine to join the separatists Moscow has supported, and Kiev maintains that weapons have flowed in across them.

His previous statement on Crimea seemed diplomatic.

"I can say that all the issues have not been easy, including the reaction to Crimean question I have raised. Still, we will be working on reaching the goals we have set and the negotiations start Sunday," Poroshenko said.

But in his address on Saturday, he spoke of the meeting with Putin in more assertive language.

"Yesterday I made a firm statement about it to the Russian leadership in Normandy."

"Crimea was, is and will be Ukrainian soil," he said.

There will be no trade-offs about Crimea and Ukraine's European choice or its form of government.

Tough on armed separatists

As relieving as the prospect of negotiations may seem, the Ukrainian President did not seem to shy away from confrontation, even during his campaign.

He won the Presidency in May's election with a stern platform that called for few compromises with the separatists or Moscow, and both have called for him to pull back the Ukrainian army from separatist strongholds.

He has threatened to send it marching into them.

Poroshenko's inauguration speech will be scrutinized there, as well as in Moscow.

He has said that dialogue with Russia is necessary for peace and security.

And on Saturday, he set the tone for his country's conversation with itself and the world.