Russia-Ukraine War: What to know on Day 7 of Russian assault

As Day 7 of the Russia-Ukraine conflict dawned, Russia continued its attacks on crowded Ukrainian cities and a lengthy convoy of Russian tanks and other vehicles advanced slowly toward the capital of Kyiv.

Russia's escalation Wednesday came as President Joe Biden, in his State of the Union speech to Americans on Tuesday night, warned that if the Russian leader didn’t “pay a price” for the invasion, the aggression wouldn’t stop with one country.

Here's a look at key things to know about the conflict:

WHAT’S HAPPENING ON THE GROUND

A 40-mile (64-kilometer) convoy of hundreds of Russian tanks and other vehicles advanced slowly on Kyiv, a city of nearly 3 million people. The West feared it was part of a bid by Putin to topple the government and install a Kremlin-friendly regime. The Russians also pressed their assault on other towns and cities, including the strategic ports of Odesa and Mariupol in the south.

A senior U.S. defense official said Russia’s military progress has slowed, plagued by logistical and supply problems. Some Russian military columns have run out of gas and food, the official said, and morale has suffered as a result. The Russian military has also been stalled by fierce resistance on the ground and a surprising inability to completely dominate Ukraine’s airspace.

Ukraine’s Defense Ministry said it had evidence that Belarus, a Russian ally, is preparing to send troops into Ukraine. A ministry statement posted early Wednesday on Facebook said the Belarusian troops have been brought into combat readiness and are concentrated close to Ukraine’s northern border. Belarusian President Alexander Lukashenko has said his country has no plans to join the fight.

On Tuesday, there were attacks on the central square in Kharkiv, Ukraine's second-largest city, and a...