Link does not work or is just me?
On a side note, I hope those calls are a sign of de-escalation. Here on this side of the conflict I see reports of Ukrainian Army continue preparations for an offence. And I see reports of continued Russian forces build up with the key intent of "defence of Donetsk and Lugansk", no signs or any talks, even theoretical, about potential offense from Russia even under pretext of "preemptive defence strike".
1. No action from the Russian side will happen unless we'll see a major Ukrainian offence on Donetsk/Lugansk. (Remember that Russian force deployment began after Ukrainian force deployment, not vice verca)
2. Biden call can be both a political maneuver to show that "we've tried to talk sense in to them" before the actual offence will begin OR a leverage point in upcoming talks for something else. I sincerely hope it's the second option.