Anchored by Jake Tapper, The Lead airs at 4 p.m. ET on CNN.
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Kiev, Ukraine (CNN) - "Russia has launched large-scale incursions into Ukraine," a British government source said Friday, moving between 4,000 to 5,000 troops into its western neighbor's territory, with some 20,000 more perched on the border.
The statement comes despite Moscow's fervent claims its forces aren't in Ukraine, and significantly more than a U.S. official's earlier claim of 1,000 Russian troops.
The British source said the Russian troops are aligned in "formed units" and taking part in fighting around Luhansk and Donetsk.
(CNN) – President Barack Obama placed blame for the violence in Ukraine on Russia Wednesday.
"The violence is encouraged by Russia. The separatists are trained by Russia; they are armed by Russia; they are funded by Russia," he told reporters in Washington.
Calling sanctions against Russia already in place "effective," he said it would face additional costs and consequences for its ongoing incursion.
"Russia is already more isolated than at any time since the end of the Cold War," Obama said.
(CNN) – The United States said it has proof that Russia is firing into Ukraine.
"We have new evidence that the Russians intend to deliver heavier and more powerful multiple rocket launchers to the separatist forces in Ukraine and have evidence that Russia is firing artillery from within Russia to attack Ukrainian military positions," said State Department spokesoman Marie Harf.
Two U.S. officials said earlier Thursday that Russian troops near the border with Ukraine have broken up into smaller groups and moved closer to the border.
Kiev, Ukraine (CNN) – At least 32 people were killed and 44 injured in clashes between the Ukrainian military and pro-Russian separatists in the Luhansk region, according to the country's anti-terror office spokesman, Vladislav Seleznev.
The clashes took place Thursday afternoon and lasted for a few hours, Seleznev told CNN on Friday.
A total of 30 pro-Russian separatists and two Ukrainian soldiers were among the dead, while the injured included 37 separatists and seven Ukrainian soldiers, Seleznev said.
Kiev, Ukraine (CNN) - Sixteen people were killed an attack overnight on soldiers in Ukraine's eastern Donetsk region, local health officials said, in the latest spike in violence ahead of the weekend's presidential election.
At least 13 of those who died in Donetsk were soldiers, according to acting President Oleksandr Turchynov.