Arizona Sen. John McCain said Wednesday that Kentucky Sen. Rand Paul is “working” for Russian President Vladimir Putin, after Paul blocked the ratification of a treaty that would enable Montenegro to join the North Atlantic Treaty Organization.

“If there is objection you are achieving the objectives of Vladimir Putin, you are achieving the objectives of trying to dismember this small country, which has already been the subject of a small coup,” McCain said.

The Republican senator added, “If they object, they are now carrying out the desires and ambitions of Vladimir Putin, and I do not say that lightly.”

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Sen. Paul subsequently objected to the ratification of the treaty, and walked off the Senate floor. “That is really remarkable,” McCain said. “That a senator, blocking a treaty that is supported by the overwhelming number, perhaps 98, at least, of his colleagues, would come to the floor and object, and walk away.”

The Arizona senator said that since Paul walked off the Senate floor he must have no justification for his objection to the treaty. “So I repeat again, the senator from Kentucky is now working for Vladimir Putin,” McCain added.

Paul told The Daily Caller in a statement: “Currently, the United States has troops in dozens of countries and is actively fighting in Iraq, Syria, Libya, and Yemen (with the occasional drone strike in Pakistan). In addition, the United States is pledged to defend 28 countries in NATO. It is unwise to expand the monetary and military obligations of the United States given the burden of our $20 trillion debt.”