BRUSSELS (AP) — The United States will expand its sanctions on Russia in response to the invasion of Ukraine, targeting members of the country’s parliament and the central bank’s gold reserves, the White House announced Thursday.

At the same time, Washington will increase its humanitarian assistance by welcoming 100,000 Ukrainian refugees and providing an additional $1 billion in food, medicine, water and other supplies.

The White House announced the initiatives as U.S. President Joe Biden and world leaders gathered in Brussels for a trio of summits in response to the Russian invasion, seeking new ways to limit the economic and security fallout from the conflict.

Ukrainian President Volodymyr Zelenskyy addressed the day’s first meeting, an emergency NATO summit, where he called for “military assistance without limitations.” He pleaded for anti-air and anti-ship weapons, asking “is it possible to survive in such a war without this?”

“It feels like we’re in a gray area, between the West and Russia, defending our common values,” Zelenskyy said during the video address. “This is the scariest thing during a war — not to have clear answers to requests for help!”