CRACKDOWNS BEGINS

MOSCOW — Vladimir Putin took the oath of office in a brief but regal Kremlin ceremony on Monday, while on the streets outside thousands of helmeted riot police prevented hundreds of demonstrators from protesting his return to the presidency.

Putin, 59, has ruled Russia since 2000, first as president and then during the past four years as prime minister. The new, now six-year term will keep him in power until 2018, with the option of running for a fourth term.

"I consider serving the fatherland and our people to be the meaning of my whole life and my duty," Putin said in addressing 3,000 guests in a Kremlin hall glittering with gold leaf.

Despite unprecedented security measures in the center of Moscow, where streets were closed to traffic and passengers prevented from exiting subway stations, at least 1,000 opposition activists tried to protest along the route Putin's motorcade. Police picked out anyone wearing the white ribbons that symbolized the anti-Putin protest movement.

The demonstrators, separated into several groups, were met by helmeted riot police. At least 120 were detained, including opposition leader Boris Nemtsov, who was grabbed while sitting at an outdoor cafe. In the evening, dozens of protesters gathered outside the presidential administration, and police detained them one by one, escorting them onto buses.

Putin's inauguration came a day after an opposition protest drew more than 20,000 people, fewer than the mass demonstrations in the months that preceded his March election but still a sign that the anger over Putin's heavy-handed return to the Kremlin has not faded.

Sunday's protest turned violent when some demonstrators tried to march toward the Kremlin and riot police beat back the crowds with batons and detained more than 400 people. The use of force after the winter's peaceful rallies indicates that Putin may take a harder line toward the protesters now that he is once again president.

More than 100 of those detained Sunday were men under the age of 27, and thus eligible for military conscription, and at least 70 of them were ordered to report to draft offices, the Interfax news agency reported, citing a military official.

After taking the oath of office with his right hand on a red-bound copy of Russia's constitution, which had been carried into the hall by goose-stepping Kremlin guards, Putin stated his commitment to democracy.

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