There was fighting in Crimea after rally for unity in Ukraine. Meanwhile, 30,000 Russian soldiers were in Crimea, that is 5,000 more than the amount authorized in the agreements between Moscow and Kiev contingent
"I'm going to the U.S. to participate in high-level meetings with the aim of resolving the situation in Ukraine," said the prime minister was quoted by the Interfax agency, although no further details.
"It's our land, so we will not give an inch. That Russia and its president (Vladimir Putin) know it," Yatseniuk had declared at the start of the demonstration in honor of Shevchenko, symbol of the independence of Ukraine.
During the demonstration, the interim president Olexander Turchinov asked for a moment of silence for those killed during the three months of protests that led to the ouster of former President Viktor Yanukovich on 22 February.
Meanwhile, in some cities of Ukraine arguments and fights between citizens who were on the streets to mark the bicentenary of the birth of the great Ukrainian poet Taras Shevchenko were recorded. Tensions were among those who defend the new government and those who support the Russian intervention.
Tension remains intense in the Crimea, where the local parliament has challenged the authority of Kiev to organize for the March 16 referendum on integration into Russia.
In Sevastopol harbor that houses the headquarters of the Russian Black Sea fleet, attacked pro-Russian security services of a demonstration of a few hundred supporters of the new Ukrainian authorities.
The Ukrainian Defense Ministry said that Russian forces reinforce "their positions near Scharff and Armiansk" in northern Crimea.
General Mykola Kovil, a senior border guards recently indicated that 30,000 Russian troops were in Crimea, that is 5,000 more than the amount authorized in the agreements between Moscow and Kiev quota.
Border guards reported that pro-Russian forces on Saturday damaged material from a Ukrainian military enclave used to monitor maritime traffic, after accessing it.
Russia announced on Saturday the possibility of suspending foreign inspections of its arsenal of strategic weapons, including nuclear missiles in response to the "threat" of the United States and NATO.
traducción: Belén Zapata