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US should supply weapons to Ukraine: Advisor

The response by the United States to Russia's actions in the Ukraine is not enough to deter Moscow, the Atlantic Council's Ian Brzezinski told CNBC's "Street Signs" Friday.

"You are going to have to have a military component to give credibility to U.S. opposition and outrage over this invasion of Ukraine and to deter further Russian aggression," he said.

Specifically, he thinks the U.S. should provide Ukraine "weapons, defensive weapons, anti-tank weapons [and] surface to air missiles–things that would really complicate Russian military planning if they do an incursion into eastern or southern Ukraine."

Ian Brzezinski in 2003
Scott J. Ferrell | CQ-Roll Call | Getty Images
Ian Brzezinski in 2003

Brzezinski believes the next step of sanctions imposed by the U.S. and its allies will be the continuation of "pin-prick sanctions" against specified individuals and a limited set of economic entities in Russia.

On Friday, President Barack Obama said the U.S. is prepared to impose targeted sanctions against Russia. However, the president is apparently having a difficult time garnering European support for stronger sanctions, according to Reuters.

Read More US, allies to impose targeted sanctions on Russia

For sanctions to have an effect, Brzezinski said they need to be financial ones "that would hit the Russian economy hard and resonate deeply through the corridors of the Kremiln."

However, those tougher sanctions could mean trouble for Western energy companies doing business in Russia.

At the moment, he said, names such as Exxon-Mobile and Shell aren't affected by the current sanctions because they are important sources of investment and are helping develop Russia's industrial base. However, he warned if the sanctions really have an influence on the Russian economy, the companies should be prepared for the Russian government to take action against them.

Read More Some Western firms could face Russian retaliation

By CNBC's Michelle Fox

Reuters contributed to this report

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