Russia Ukraine: Biden warns Russia about "red lines" in Ukraine

Joe Biden warned that he would not accept the "red lines" set by Moscow amid growing concerns that Russia was planning an imminent invasion of Ukraine. The U.S. president said he would make it "very, very difficult" for Russia to penetrate its neighbor.

Meanwhile, U.S. media reported that intelligence officials fear an invasion could begin as early as 2022. This comes as Ukraine says Russia has increased its army at the border and is amassing about 94,000 troops there.

A video call between Russian President Vladimir Putin and Biden is set to defuse this week's tensions. The U.S. president told reporters he expected lengthy discussions with the Russian leader and warned that he "wouldn't accept anyone's red line."

"What I did was put together what I believe are the most comprehensive and meaningful initiatives to make it very, very difficult for Putin to move forward and do what people are worried about," Biden said while speaking at the Started presidential retreat. At Camp David.

Until Biden reveals precisely what action the United States is planning, U.S. and Ukrainian officials again warned this week that tough economic sanctions against Russia were under discussion.

Biden's comments came after the Washington Post reported that U.S. intelligence agencies feared the Kremlin planned a multi-faceted attack with 175,000 troops early next year. Officials also reportedly noted an increase in propaganda efforts through proxies and the media to denigrate Ukraine and NATO from a possible invasion.

Ukrainian Defense Minister Alexei Reznikov said the most likely time for Russia's escalation was "late January." Russian troop deployment: view from the Ukrainian front line. This week, Britain's top military officer said he should be "on alert" about potential conflict in the region.

General Sir Nick Carter told the he was "clearly hopeful" that there would be no war with Russia but added that NATO should be prepared for the eventuality. Tensions between Russia and Ukraine are not new. In 2014, Russia annexed Ukraine's Crimean peninsula and soon began supporting a separatist insurgency in eastern Ukraine that periodically killed around 14,000 people.

Recently, Ukrainian President Vladimir Zelenskyi defied Russian interests by imposing sanctions on an influential friend of President Putin and banning three pro-Russian television channels from broadcasting.