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Russian President Vladimir Putin ordered troops taking part in military exercises in western Russia near the border with Ukraine to return to their bases, Russian news agencies reported Tuesday, citing a statement from the Kremlin.

The Interfax and RIA-Novosti news agencies attributed the information to Dmitry Peskov, Putin's spokesman. Attempts by USA TODAY to reach Peskov to confirm if the move was an attempt to de-escalate tensions in the strategic Crimean peninsula were not immediately successful.

"Russian Armed Forces Supreme Commander-in-Chief, President Vladimir Putin ordered the forces engaged in the military exercises to return to their permanent bases," the statement, which deemed the operations successful, reportedly said.

However, no explicit mention was made in the statement of the estimated 16,000 Russian troops thought to be in Crimea, and the development comes amid reports of a confrontation between Ukrainian and Russian forces near the Belbek air base.

Pro-Russian troops who had taken control of the air base fired warning shots into the air as around 300 Ukrainian soldiers, who previously manned the airfield, demanded their jobs back, the Associated Press and others reported. Video footage obtained by the BBC appeared to confirm the encounter.

A journalist for the Israeli newspaper Haaretz wrote separately on Twitter that "Crimeans are coming to [Belbek] base to try and evict the Ukrainian soldiers."

The shots, reflecting the tense atmosphere that has taken hold in the Crimea, are the first ones fired in the standoff that has threatened to entangle the West and that is casting doubt on Ukraine's future. There were no reports of injures and the incident appears to be an isolated one.

President Putin is expected to make an address in Moscow later Tuesday although it is not clear what he will talk about.

Earlier, a Russian admiral issued an ultimatum to Ukraine's military in Crimea, later denied by Russian officials, to surrender at dawn Tuesday, as Moscow said the crisis can be defused if the country agrees to take back its ousted pro-Moscow President Viktor Yanukovych.

But that deadline appears to have mostly passed without incident.

Still, amid rising international tensions, the Pentagon has halted all military cooperation with Russia, including exercises and meetings, Rear Adm. John Kirby said.

There were broader economic actions as well. U.S. Trade Representative Michael Froman's office said it suspended upcoming bilateral trade and investment talks with Russia.

"Due to recent events in Ukraine, we have suspended upcoming bilateral trade and investment engagement with the Government of Russia that were part of a move toward deeper commercial and trade ties," the Froman's office said in a statement.

That move comes as Secretary of State John Kerry was on his way to Kiev Tuesday for talks there with the interim government, which the Kremlin does not recognize.

In Washington on Monday, President Obama said Russia is "on the wrong side of history'' by intervening in Ukraine. He said he is considering diplomatic and economic steps to isolate Moscow.

"Over time this will be a costly proposition for Russia, and now's the time for them to consider whether they can serve their interests in a way that resorts to diplomacy as opposed to force," Obama said from the Oval Office.

But Moscow reportedly shot back Tuesday. An unnamed Kremlin aide said that if the U.S. were to impose sanctions, Moscow may be forced to drop the dollar as a reserve currency, Reuters reported. Russia also reversed an earlier decision to lift a ban on pork imports from the U.S., saying the existing U.S. system of checks don't guarantee its safety, the Associated Press reported.

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