Robert O’Brien, the former National Security Advisor to President Donald Trump, says the West has to be realistic about allowing Ukraine to join NATO and realize that such membership is anathema to Russia. “To bring a country into NATO and the alliance that's in a war with Russia is very provocative to the Russians, and could lead to escalation, even nuclear war,” he told Fox News.

"We can certainly give Ukraine security guarantees … put eastern European troops [in Ukraine] to help secure peace after a peace deal gets done. But NATO is too provocative at this point,” he said, adding that it “risks World War III.”

O'Brien's willingness to accommodate the hard reality of realpolitik sounds like a reflection of Republican presidential nominee Trump’s desire to find peace in Ukraine and not continue to endlessly finance Ukraine’s defense. Ukrainian President Volodymyr Zelensky’s “victory plan” involves granting his country NATO status and embroiling the US in a war with Russia: both direct trips to a nuclear confrontation.

O’Brien could be back in the NSA role or perhaps even secretary of state if Trump wins reelection on Nov. 5. When asked if he would accept a cabinet position in a new Trump White House, O’Brien told Fox News, "Of course" "It's always an honor to serve the country and to serve the president. But I’m not campaigning for a job," he said. "There are a lot of really great people who'd like to work for the president."

O’Brien believes Russia must be brought to the negotiating table in order to secure a meaningful peace. He advocates harsher economic sanctions against Russia if its president, Vladimir Putin, is unwilling to participate in a ceasefire.

"The sanctions have been relatively minor," O’Brien said. "They haven’t sanctioned the Russian Federation Central Bank. They haven’t kicked folks out of SWIFT. They’ve taken a few oligarchs’ yachts."

Treasury Secretary Janet Yellen is on the verge of announcing new sanctions that the Biden-Harris administration believes could hamper Russia’s production f war materials, Fox News noted. The sanctions could be directed at the sources of some Russian supplies.

"Ukraine is going to be in real demographic trouble if it doesn’t stop the war," O'Brien told Fox. "We're going to leave it to Ukrainians to decide what they're willing to trade for peace."