Dmitry Rogozin and Sergei Glazyev confer during a press conference in Moscow in December 2003.

Putin Adviser Threatens Russian Intervention in Ukraine

U.S. officials deny allegations they are funding Ukrainian protesters.

Dmitry Rogozin and Sergei Glazyev confer during a press conference in Moscow in December 2003.

Sergei Glazyev, right, an adviser to Russian President Vladimir Putin, has threatened to intervene in Ukraine if the political crisis is not resolved soon.

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A senior adviser to Russian President Vladimir Putin has accused the U.S. of supplying weapons to Ukrainian protesters and warned that Russia might be forced to intervene if the political crisis isn't resolved soon.

“There is information that within the grounds of the American Embassy, there is training for fighters, that they're arming them,” Sergei Glazyev said. He also said that U.S. agents gave “$20 million a week” for weapons and aid to assist “the opposition and rebels” in Kiev.

The senior Kremlin aide told the Kommersant-Ukraine newspaper that U.S. "interference" violated a 1994 treaty created when Ukraine relinquished its nuclear arsenal, Reuters reported. 

"Under the document, Russia and the USA are guarantors of the sovereignty and territorial integrity of Ukraine and ... are obliged to intervene when conflict situations of this nature arise," Glazyev said. "And what the Americans are getting up to now, unilaterally and crudely interfering in Ukraine's internal affairs, is a clear breach of that treaty. The agreement is for collective guarantees and collective action."

[READ: EU Diplomat Meets Ukraine's Embattled President Yanukovych During Stalemate]

The U.S. Embassy in Kiev denied Glazyev’s allegations, saying they “are entirely false and should be given no credence,” CBS News reported.

Protesters say Russian military involvement is expected if Ukrainian President Viktor Yanukovych agrees to their demands.

"Everyone knows that Russia is going to send troops to Ukraine – we have known it for a long time now," said Kateryna Chorna, a Ukrainian who has participated in multiple protests, according to USA Today.

[ALSO: Radicals With a Taste for Violence Are Wild Card in Ukraine's Protests]

Glazyev said the Ukrainian government should not be negotiating with the protesters, and that force should be used “where the authorities face an attempted coup.”

Both the U.S. and Russia are working with Yanukovych to find a solution to the political strife. On Thursday, Yanukovych met with U.S. Assistant Secretary of State Victoria Nuland in Kiev, and Yanukovych is scheduled to talk with Putin Friday during the opening ceremony of the Winter Olympics in Sochi.