THE HAGUE, Netherlands (TheBlaze/AP) — President Barack Obama acknowledged for the first time Tuesday that Russia is unlikely to surrender control of the strategically important peninsula it annexed from Ukraine, conceding that Western condemnations have had little effect on Vladimir Putin.

Obama was pressed by ABC’s Jonathan Karl on the possibility that U.S. influence — and his influence — around the globe is declining. He also asked the president if his former GOP presidential candidate Mitt Romney was right when he called Russia the “top geopolitical foe” of America.

See How Obama Answers ABC Reporter’s Tough Question on Russia and Mitt Romney

U.S. President Barack Obama speaks at a press conference after the Nuclear Security Summit (NSS) in The Hague, Netherlands, Tuesday, March 25, 2014. (AP Photo/Toussaint Kluiters, Pool)

At the time, Obama dismissed as a relic of Cold War-era thinking.

Obama took aim at Romney’s assertion again Tuesday, using Karl’s question as an opportunity to derisively cast Russia as little more than a “regional power” that threatens its allies, but not the U.S. The pointed comment appeared to take aim at what Western officials see as Putin’s insecurity over Russia’s standing in the world.

“Russia is a regional power that is threatening some of its immediate neighbors – not out of strength, but out of weakness,” Obama said. Still, he added that “it would be dishonest to suggest there is a simple solution to what has already taken place in Crimea,” where Russian troops are in control.

Watch the video below:

Here Obama addresses Romney’s past comments:

Obama insisted the international community would never recognize Russia’s takeover of Crimea. But he and European leaders, gathering in the Netherlands for a two-day nuclear summit, said a military response against Moscow was unlikely. The leaders focused much of their attention on keeping Russia from expanding elsewhere in Ukraine – even if that means enacting broad sanctions that have negative implications for their own economies.

“Some particular sanctions would hurt some countries more than others,” Obama said during a joint news conference with the Dutch prime minister, Mark Rutte. “But all of us recognize that we have to stand up for a core principle that lies at the heart of the international order.”

The president spoke a day after the U.S. and its partners in the Group of Seven economic forum declared that they were indefinitely suspending cooperation with Russia, which often joins with the G-7 nations to form the Group of Eight. The leaders also said they were prepared to impose sanctions on key sectors of the Russian economy, including its energy and defense industries.

Russia’s brazen incursion into Ukraine has become a fierce challenge to Obama’s leadership on the world stage. He arrived in the Netherlands, the first stop on a weeklong trip abroad, facing withering criticism from Republicans who have charged that the president underestimated Putin or misjudged the Russian leader’s intentions.

In a sign of how difficult it would be to roll back Russia’s advances, Ukrainian soldiers in Crimea piled onto buses and began their journey to Ukrainian territory on Tuesday following a withdrawal order from the central government in Kiev. A former comrade saluted them from outside a base overrun by Russian forces.