* President Joe Biden acknowledged it was a 'real threat' that Vladimir Putin might use chemical weapons in the Ukraine
* Biden left for Europe for meeting with NATO leaders, the E.U. and the G7
* He'll also make a stop in Poland to visit troops, meet with Duda
* While in Brussels he will announce more sanctions on Russians
* He may also announce more U.S. troops to NATO countries in Eastern Europe
* Trip comes as allies reaching their limits on how they can punish Putin
* Zelensky will address NATO summit via video link
President Joe Biden on Wednesday acknowledged it was a 'real threat' that Vladimir Putin might use chemical weapons in the Ukraine, a topic of concern for world leaders ahead of their NATO summit.
'I think it's a real threat,' Biden told reporters ahead of his departure for Brussels.
Officials have been concerned that Putin will use more aggressive tactics and disruptive weapons as his invasion of the Ukraine reaches a stalemate.
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President Biden Leaves To Europe For Meeting With NATO Leaders, The E.U., And The G7
Biden heads to high-stakes NATO summit amid showdown with Putin over Ukraine -- ABC News
Biden heads to Belgium and Poland to address Russia's war on Ukraine -- CBS
Biden seeks new sanctions, help for Ukrainians in Europe -- AP
Biden Takes Tough-on-Putin Message to Allies Riven by Own Needs -- Bloomberg
Biden Travels for NATO Talks on Ukraine, Will Announce More Russia Sanctions -- VOA
Biden heads to Europe with more sanctions for Russia -- Reuters