President Biden reaffirmed U.S. support for the people of Ukraine and vowed to hold Russia accountable for its aggression in a statement on Thursday, the 7th anniversary of Russia's 2014 invasion of Crimea.

Why it matters: The statement reflects the aggressive approach Biden is taking to Russia, which he classified on the campaign trail as an "opponent" and "the biggest threat" to U.S. security and alliances.

• It's also a departure from his most recent predecessors, who avoided direct confrontation with the Kremlin.
• Former President Trump reportedly told G7 leaders in 2018 that Crimea is Russian because the people who live there speaks Russian, and frequently blamed former President Obama for being "outsmarted" by Putin during the 2014 invasion.

What they're saying: "The United States continues to stand with Ukraine and its allies and partners today, as it has from the beginning of this conflict.  On this somber anniversary, we reaffirm a simple truth: Crimea is Ukraine," Biden said in a statement.

• "The United States does not and will never recognize Russia’s purported annexation of the peninsula, and we will stand with Ukraine against Russia’s aggressive acts," he continued.
• "The United States still believes in the promise of Ukraine and we support all those working towards a peaceful, democratic, and prosperous future for their country."

The big picture: Biden held his first call with Russian President Vladimir Putin last month, using the conversation as an opportunity to press the Russian leader on the arrest of opposition leader Alexey Navalny and the Russia-linked hack on U.S. government agencies.

• Beyond Crimea and the war in eastern Ukraine, Biden must also confront the Kremlin on a range of issues, including its interference in U.S. elections and allegations of bounties on U.S. troops in Afghanistan.
• Meanwhile, Ukrainian President Volodymyr Zelensky is hoping to reset the U.S.-Ukraine relationship under the new administration and with President Biden — whom he has yet to meet. Biden was in charge of the Obama administration's Ukraine policy as vice president and championed anti-corruption forms.

Go deeper: Biden's Russia challenge