During their summit by secure video link on Tuesday, Mr. Biden warned Mr. Putin of a "strong" Western economic response should Moscow attack its neighbor.
He refused to say if he planned to move troops massing on Ukraine's frontier across the border but said that simply watching NATO move closer to Russia would amount to "criminal inaction.
The Russian leader stressed that NATO expanding eastwards is a "very sensitive" issue for Russia. "
On Tuesday, Mr. Putin told Mr. Biden Moscow seeks legal guarantees from the West that Ukraine would not join NATO.
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