During a joint news conference with Ukrainian President Volodymyr Zelensky, President Biden said the U.S. will support Ukraine “as long as we can.” Zelensky was on Capitol Hill meeting with lawmakers and advocating for more aid. CNN Chief International Security Correspondent Nick Paton Walsh joins AC360 from Zaporizhzhia, Ukraine where he's been talking to troops about their "concern, anger and frustration" about the potential of not getting more U.S. funding to help fight the Russians. Plus, a U.S. official tells CNN that Israel has started flooding Gaza tunnels with seawater on a "limited basis." CNN Chief National Security Correspondent Alex Marquardt is in Tel Aviv, Israel. He tells Anderson Cooper that this could be a "significant new tactic" by the Israeli military.

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