“Madness and scaremongering continues. … what if we would say that US could seize London in a week and cause 300K civilian deaths?” Dmitry Polyanskiy tweeted Sunday.

Military instructors teach civilians during a training session outside the Ukrainian city of Odessa on Feb. 5. U.S. officials are warning there could be as many as 50,000 civilian casualties if Russia invades.© Oleksandr Gimanov/AFP/Getty Images Military instructors teach civilians during a training session outside the Ukrainian city of Odessa on Feb. 5. U.S. officials are warning there could be as many as 50,000 civilian casualties if Russia invades.

The updated U.S. military and intelligence assessments briefed to lawmakers and European partners over the past several days were U.S. officials’ bleakest assessment yet of the deteriorating security situation in Ukraine. They came as the Biden administration was also warning that Moscow was considering filming a fake attack against Russian territory or Russian-speaking people by Ukrainian forces as a pretext to invade its neighbor — a claim the Kremlin has strenuously denied.

Seven people familiar with the assessments said Russian President Vladimir Putin now has 70 percent of the combat power he needs for an assault that — under the most extreme scenario — could quickly take out the capital, Kyiv, and remove the country’s democratically elected president, Volodymyr Zelensky. Such an invasion, they said, could trigger a refugee crisis in Europe as up to 5 million people flee.

As of Friday, there were 83 Russian battalion tactical groups, with about 750 troops each, arrayed for a possible assault. That is up from 60 two weeks ago.

The White House has said the United States does not have information that Putin has made a decision to invade. But satellite imagery and other intelligence indicate he has amassed more than 100,000 troops and equipment on the border with Ukraine — one Western security official put the number at 130,000 — potentially positioning for what could become the largest military land offensive in Europe since World War II.

“Our worry would be that you don’t park battle groups … on the border of another country twice and do nothing,” one European official said, referring to an earlier buildup last year. “I think that’s the real fear that I have. [Putin’s] now put them all out there. If he does nothing again … what does that say to the wider international community about the might of Russia?”

The European official and others familiar with the assessments spoke on the condition of anonymity about intelligence matters.

Many expect potential Russian military aggression to also come from the northeast and east, where pro-Moscow separatists control Ukrainian territory in Donbas, and more than 100,000 Russian troops have amassed on the country’s border with Ukraine.© The Washington Post Many expect potential Russian military aggression to also come from the northeast and east, where pro-Moscow separatists control Ukrainian territory in Donbas, and more than 100,000 Russian troops have amassed on the country’s border with Ukraine.Although U.S. officials believe an assault could be launched any day, optimal conditions are believed to come between mid-February and the end of March, when Ukraine’s flat, open terrain and the rivers cross-crossing it are frozen and armored vehicles can maneuver easily.

One possibility is that Putin may delay until after the Winter Olympics in Beijing conclude Feb. 20, in order not to upset China by overshadowing the games and threaten Chinese financial assistance in response to U.S. sanctions.

Moscow has denied that it intends to invade Ukraine, but it has made clear it considers the presence of Western troops and weapons in the former Soviet sphere an unacceptable security threat. Putin has accused the United States and its European allies of ignoring his key demands to bar Ukraine from joining NATO, rule out putting offensive strike weapons on Russia’s borders and roll back the NATO’s weaponry and force posture to its 1997 boundaries.

Russia also has attempted to paint Ukraine as the aggressor in the crisis, warning a NATO-backed Kyiv could try to take back Crimea, which was annexed by Moscow in 2014. Meanwhile, some Ukrainian officials, including President Zelensky, have taken issue with Washington’s description of Russian deployments and the likelihood of an “imminent” attack, fearing it will cause panic and hurt Ukraine’s economy.

The latest grim assessment from U.S. officials indicates the window for negotiating a diplomatic solution to the crisis is closing.

President Biden is set to meet this week with new German Chancellor Olaf Scholz, who has been accused of not doing enough to respond to Russian aggression. Germany has been reluctant to export arms to Ukraine, much to the consternation of Kyiv, though Scholz has recently indicated that “all options” — including the controversial Nord Stream 2 gas pipeline that would deepen Berlin’s reliance on Moscow for energy — are on the table for sanctions in the case of a renewed Russian invasion.

Putin, meanwhile, has been reinforcing his own diplomatic support network. After a meeting Friday with Chinese President Xi Jinping at the opening of the Winter Olympics, the two leaders issued a lengthy communique affirming their mutual grievances over global issues including NATO expansion and security alliances in the Asia-Pacific region.

Secretary of State Antony Blinken is set to travel to Australia and the Pacific this week for talks, including a gathering of his counterparts from India, Australia and Japan, who are part of an emerging partnership, known as the Quad, united in their misgivings about China.

A Russian invasion of Ukraine could “embarrass Beijing,” because “it suggests that China is willing to tolerate or tacitly support Russia’s efforts to coerce Ukraine,” Daniel Kritenbrink, the top U.S. diplomat for East Asia, told reporters Friday in a briefing ahead of the visit.

Shane Harris in Washington and Amy Cheng in Seoul contributed to this article.

Russian official dismisses new U.S. assessment of potential Ukraine invasion as ‘madness and scaremongering’ (msn.com)