 President Biden hosting a NATO summit starting Tuesday in Washington, where security is high and where ABC's Perry Russom is. At the summit, the U.S. is expected to announce new steps to strengthen Ukraine's air defenses and military capabilities. And there will be significant announcements on increasing NATO's military, political and financial support for Ukraine. On the sidelines of the summit, President Biden will host an event with Ukraine's President Volodymyr Zelensky, along with other NATO leaders. First time a NATO summit has been in Washington in more than 20 years.