Russia reserves the right to use "all means" to protect citizens in Ukraine, he told a news conference.Russian and Ukrainian troops in Crimea are involved in a tense stand-off.Mr Putin called the toppling of President Viktor Yanukovych in the capital Kiev an "anti-constitutional coup and armed seizure of power".He said "militants" had plunged the country into "chaos". He also said Ukrainian "nationalists" and "anti-Semites" were roaming the streets of Kiev and other cities.Mr Yanukovych had agreed to all that the opposition wanted, Mr Putin said.He insisted that Mr Yanukovych was still the legitimate president.There were only three legal means to remove a president, he said: death, personal resignation or impeachment.(BBC)ANN.Az