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McCain On Ukraine: 'It's Not The Cold War Over Again'

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AP Photo / Tobias Hase

McCain also conceded that at this point, Crimea belong to Russia.

"It's a done deal," he said about Crimea's referendum to join Russia."You can’t say that there’s anything but a fait accompli."

That doesn't mean that the U.S. should give up, however, he added.

McCain listed a few of the U.S. options that could help Ukraine eventually regain Crimea, including some military assistance to Ukraine and economic sanctions against Russia.

He said that the U.S. needs a "fundamental reassessment of our relationship with Vladimir Putin."