The Russian military is on the move toward the border with Ukraine, with American intelligence suggesting that Moscow is preparing for an offensive involving some 175,000 troops.

Could the moves herald a full-scale invasion? And if so, what is driving President Vladimir V. Putin’s brinkmanship over Russia’s southwestern neighbor?

Guest: Anton Troianovski, the Moscow bureau chief for The New York Times.

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Background reading: 

• There are tactical reasons for Russia’s threatening an invasion of Ukraine, but the real cause may lie in the Kremlin’s fixation with righting what it sees as a historical injustice.
• After eight years in the trenches, Ukrainian soldiers are resigned to the possibility that the Russian military, which dwarfs their own in power and wealth, will come sooner or later.
• In a tense meeting with Mr. Putin, President Biden said that a Russian invasion of Ukraine would result in heavy economic penalties.

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