During a trip to Europe this week, U.S. President Joe Biden will discuss further Western reactions to the Russian invasion of Ukraine, including assistance to Kyiv and pressure on Russia, national security adviser Jake Sullivan said during a press conference.

"The President is heading to Europe tomorrow to reinforce the incredible unity we built with Allies and partners in response to Russia's brutal invasion of Ukraine and to consult on next steps," he said.

"He will attend an emergency NATO Summit, joined by the leaders of the other 29 NATO Allies. He will join the G7 leaders. And he will address the 27 leaders of the European Union at a session of the European Council," Sullivan said.

In particular, these events will discuss topics such as military assistance to Ukraine and putting pressure on Russia with the help of sanctions, both through the development of new measures and the tightening of existing ones.

"He will announce joint action on enhancing European energy security and reducing Europe's dependence on Russian gas at long last," Sullivan said.

From Brussels, Biden will travel to Poland, where he will meet with U.S. military personnel, as well as with humanitarian experts. In Poland, he will also meet with Poland's President Andrzej Duda.