Russian President Vladimir Putin put his country's nuclear deterrence forces on high alert Sunday amid a growing global backlash against Russia's invasion of Ukraine. Despite the escalation, Ukraine's Defense Ministry said representatives for Ukraine and Russia have agreed to meet on the Ukraine-Belarus border "with no preconditions."
Meanwhile, the Russian advance into Ukraine continues. Russian military vehicles entered Ukraine's second-largest city Kharkiv with reports of fighting taking place and residents being warned to stay in shelters.
The capital of Kyiv remained under Ukrainian control, with a key official in Kyiv's city administration asserting that "the capital is completely controlled by the Ukrainian army and defense."
Here are links to additional CNBC coverage of the Russian invasion of Ukraine: