Kyiv, February 23: Russia began evacuating its embassy in Kyiv, and Ukraine urged its citizens to leave Russia on Wednesday as the region braced for further confrontation after President Vladimir Putin received authorization to use military force outside his country and the West responded with sanctions.

Hopes for a diplomatic way out of a new, potentially devastating war in Europe appeared all but sunk as the U.S. and key European allies accused Moscow on Tuesday of crossing a red line in rolling over Ukraine's border into separatist regions — with some calling it an invasion.

Russia began pulling personnel from its diplomatic posts in Ukraine, state news agency Tass reported, a day after the Foreign Ministry announced a plan to evacuate, citing threats. By Wednesday afternoon, the Russian flag was no longer flying over the embassy in Kyiv, and police surrounded the building.

After weeks of trying to project calm, Ukrainian authorities also signaled increasing concern on Wednesday. The Foreign Ministry advised against travel to Russia and recommended anyone there leave immediately, saying Moscow's “aggression” could lead to a significant reduction in consular services.  Russia-Ukraine Crisis: Ukraine to Impose Martial Law, Say Reports.

The head of Ukraine's National Security and Defense Council called for a nationwide state of emergency — subject to parliamentary approval. Oleksiy Danilov said it will be up to regional authorities to determine which measures to apply, but they could include additional protection for public facilities, restrictions on traffic, and additional transport and document checks.

These were just the latest in a series of signs of escalating tensions. Kyiv recalled its ambassador to Russia and considered breaking all diplomatic ties with Moscow; dozens of nations further squeezed Russian oligarchs and banks out of international markets; Germany halted a lucrative pipeline deal; the U.S. repositioned additional troops to NATO's eastern flank bordering Russia; and the top U.S. diplomat canceled a meeting with his Russian counterpart. Already, the threat of war has shredded Ukraine's economy and raised the specter of massive casualties, energy shortages across Europe and global economic chaos.

Even as the conflict took a new, dangerous turn, leaders warned it could still get worse. Putin has yet to unleash the force of the 150,000 troops massed on three sides of Ukraine, while U.S. President Joe Biden held back on even tougher sanctions that could cause economic turmoil for Russia but said they would go ahead if there is further aggression. German Foreign Minister Annalena Baerbock on Wednesday called European Union sanctions agreed a day before just “a first step” and also said further measures could follow. Sanctions are key because the West has ruled out taking on Russia militarily. Ukrainian Foreign Minister Dmytro Kuleba urged Western leaders not to wait.

“We call on partners to impose more sanctions on Russia now," he wrote on Twitter on Wednesday. "Now the pressure needs to step up to stop Putin. Hit his economy and cronies. Hit more. Hit hard. Hit now.”

Responding defiantly to the steps already taken, Russian ambassador in the U.S. Anatoly Antonov retorted that “sanctions cannot solve a thing” in a statement on Facebook. “It is hard to imagine that there is a person in Washington who expects Russia to revise its foreign policy under a threat of restrictions.” Russia's Foreign Ministry has also bristled at the sanctions. “Russia has proven that, with all the costs of the sanctions, it is able to minimize the damage,” a statement read. In Ukraine's east, where an eight-year conflict between Russia-backed rebels and Ukrainian forces has killed nearly 14,000 people, violence also spiked again. One Ukrainian soldier was killed and six more sustained injuries after shelling by the rebels, Ukrainian military said. Separatist officials reported several explosions on their territory overnight and three civilian deaths. Ukraine-Russia Crisis: Vladimir Putin Claims Minsk Agreements to Avoid War No Longer Exist.

In St. Petersburg, meanwhile, several hundred people reportedly staged a rally in support of the self-proclaimed Donetsk and Luhansk republics in Ukraine's east, while Russia celebrated Defender of the Fatherland Day, a holiday that remembers the country's veterans and often sees shows of patriotism.

After weeks of rising tensions, Putin took a series of steps this week that dramatically raised the stakes. First, he recognized the independence of those separatist regions. Then, he said that recognition extends even to the large parts of the territories now held by Ukrainian forces, including the major Azov Sea port of Mariupol.

Finally, he asked for and was granted permission to use military force outside the country — effectively formalizing a Russian military deployment to the rebel regions. Putin laid out three conditions that he said were the only ways out of the crisis: He called on Kyiv to recognize Russia's sovereignty over Crimea, the Black Sea peninsula that Moscow annexed from Ukraine in 2014, to renounce its bid to join NATO and partially demilitarize. The first two demands had been previously rejected by Ukraine and the West as non-starters.

Ukrainian President Volodymyr Zelenskyy on Wednesday reiterated his call for talks with Putin. “Many times I suggested to the president of Russia to sit down at the negotiating table and talk. This is a question of dialogue, not a question of condition,'” he said after a meeting with the presidents of Poland and Lithuania. The Kremlin has previously brushed off such calls. Putin remained vague when asked whether he has sent any Russian troops into Ukraine and how far they could go, and separatist leader in Donetsk Denis Pushilin said Wednesday that there are currently no Russian troops in the region.

Pushilin's remarks contradict those of Vladislav Brig, a member of the separatist local council in Donetsk, who told reporters Tuesday that Russian troops had already moved in. (AP)