Foreign Minister Sergey Lavrov warned on Friday that Russia would respond "with concrete actions" to the alleged attempt on Russian President Vladimir Putin's life by Ukraine.

The Kremlin alleged on Wednesday that it thwarted a Ukrainian assassination plot against Putin, though Ukrainian leaders have denied the allegation. U.S. officials have not been able to verify what took place, if anything at all, and one American intelligence community leader said it could be "misinformation."

BLINKEN SAYS PUTIN ASSASSINATION CLAIMS SHOULD BE TAKEN WITH 'A VERY LARGE SHAKER OF SALT'

"It was obviously a hostile act," Lavrov said on Friday following a meeting of the Council of Foreign Ministers of the Shanghai Cooperation Organization member states, according to Russian state media Tass. "It is absolutely clear that without the knowledge of their ‘patrons,’ the terrorists in Kiev could not have committed it. We will respond not with speculations about whether or not this is a 'casus belli.' We will respond with concrete actions."

Kremlin spokesman Dmitry Peskov accused the United States of being involved with the plot on Thursday, though U.S. officials denounced the allegation.

"I would just tell you Mr. Peskov's lying. I mean, it's obviously a ludicrous claim. The United States had nothing to do with this. We don't even know exactly what happened here," National Security Council spokesman John Kirby said. "But I can assure you the United States had no role in it whatsoever."

The Kremlin claimed two unmanned aerial vehicles targeted the Kremlin, though officials were able to use electronic warfare systems to down the drones. No one was hurt in the alleged incident.

Questions still swirl regarding the validity of the Kremlin's claim about this supposed assassination attempt due to its history of using false flag operations to stage an opposition's supposedly escalatory move to justify an even larger retaliation.

Secretary of State Antony Blinken said, "I would take anything coming out of the Kremlin with a very large shaker of salt," in reference to these allegations.

Peskov's comments, and the Kremlin's threat to retaliate for the alleged plot in its initial statement, could prove to be a part of those justification efforts.

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Kirby admitted on Thursday that they are unsure if this is a false flag operation, though he noted Putin hasn't waited around for "some excuse to continue to victimize the Ukrainian people," given that dozens of Ukrainian civilians have been killed this week in renewed strikes across the country.

"Now, how Mr. Putin reacts to this alleged drone attack is going to be up to him. But it’s difficult to see — at least from where we’re sitting — it’s difficult to see that he’s sitting around waiting for some excuse to continue to victimize the Ukrainian people. Now, maybe he’ll use it that way. And I don’t know whether it was a false flag. But that’s why I pointed you to the last 24 hours. Just in the last 24 hours, two dozen Ukrainians killed, some of them shopping for food for dinner," he said.