Russia-Ukraine updates: US sanctions Russian military shipbuilder, diamond miner

National security adviser Jake Sullivan said President Joe Biden and NATO allies will roll out new coordinated plans on Thursday in response to Russia's continued invasion.

Sullivan said Biden is traveling to Europe "to ensure we stay united" with our allies and to send a message that they are committed to help Ukraine "for as long as it takes."

"There will be hard days ahead in Ukraine. Hardest for the Ukrainian troops on the front lines and the civilians under Russian bombardment. This war will not end easily or rapidly," Sullivan said.

Sullivan said NATO allies will announce new sanctions, tighten existing ones, adjust troops on the Eastern Flank and outline plans to reduce Europe’s dependence on Russian energy.

Sullivan did not disclose any specific details about the sanctions but hinted that new ones will focus on a joint effort to crack down on countries helping Russia "undermine, weaken or get around the sanctions," calling it an "important part" of this next phase.

"We have applied an enormous amount of economic pressure, and in order to sustain and escalate that pressure over time, part of that is about new designations, new targets, but a big part of it is about effective enforcement and evasion, applying the lessons that we've learned from other circumstances where we have, in fact, imposed sanctions on countries," Sullivan said.

In Poland, Sullivan said Biden will "engage" with U.S. troops, hold a bilateral meeting with President Duda and meet with experts involved in the humanitarian response.

-ABC News' Justin Gomez

Ukrainian President Volodymyr Zelenskyy addressed Italy's Parliament on Tuesday, warning that "Ukraine is the gateway to Europe for Russian troops."

He called for more sanctions so Russia "is looking not for military reserves or mercenaries somewhere in Libya or Syria, but for peace."

"This is a war that Russia has been preparing for a long time. Which one person has been preparing for a long time. One! For decades," Zelenskyy said. "Their goal is Europe."

Zelenskyy compared the Russian invasion to the Nazis, saying, "The last one who did something like this in Europe were the Nazis, when they invaded other countries."

-ABC News' Christine Theodorou

For the first time since the invasion of Ukraine, Russia's combat capability has likely fallen below 90%, a senior U.S. defense official told reporters. The official said there are no tangible indications of reinforcements being brought in from elsewhere in the country.

"[This is] combat power that they assembled in Belarus and in the western part of their country prior to the invasion. It is not an assessment of all Russian military power," the official said.

The official said there are "indications" that Ukrainian resistance is trying to retake some territory seized by Russian troops, such as the town of Izyum.

"What we're starting to see are indications that they are now able and willing to take back territory that the Russians have taken," said the official. "Whether this is a part of some sort of larger operational plan, we can't say for sure."

In Mykolaiv, northeast of Odessa, the Russians have been forced to reposition themselves to the area south of the city because Ukrainian resistance was so strong north of the city, the official said.

The logistical and resupply issues continue to plague Russian troops with the official noting that Russia now has concerns about fueling its ships in the Black Sea. Frostbite has also become an issue for Russian troops who continue to be inadequately supplied.

Ukrainian forces have mounted a strong resistance inside of Mariupol against the "significant number" of Russian forces that have made their way into the city, according to the official.

“The Ukrainians are fighting very, very hard to keep Mariupol from falling,” said the official.

Russia has fired more than 1,100 missiles in Ukraine, according to the official.

-ABC News' Luis Martinez

Russia's Defense Ministry claimed its forces pursued the retreating Ukrainian units of the 54th separate mechanized brigade, and advanced 4 kilometers on Tuesday, approaching the settlement of Novomikhailovka.

Russian-backed Donetsk troops took control of the settlement of Verkhnetoretskoe and continues to attack units of the 25th Airborne Brigade of the Armed Forces of Ukraine, according to Russia's Defense Ministry.

Russia claims two tanks, five infantry fighting vehicles, three field artillery pieces and seven off-road vehicles were destroyed.

Russia also claimed it fired air and sea-based high-precision long-range weapons at Ukrainian military facilities. It claimed it destroyed depots of fuel, lubricants, rocket and artillery weapons and ammunition.

The country's defense ministry said its operational-tactical and army aviation hit 83 military facilities of Ukraine. Among them: four command posts, four anti-aircraft missile systems, three depots of rocket and artillery weapons and ammunition, as well as 68 places of military equipment accumulation.

Russia claimed air defense systems shot down 6 Ukrainian unmanned aerial vehicles in the air, including one Bayraktar TB-2 near the village of Merefa, Kharkiv region.

In total, since the beginning of the attack, 236 unmanned aerial vehicles, 185 anti-aircraft missile systems, 1,547 tanks and other armored combat vehicles, 154 multiple rocket launchers, 612 field artillery guns and mortars, as well as 1,343 units of special military vehicles have been destroyed, Russia claims.