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Nile Gardiner of the Heritage Foundation weighs in on the progression of the Russia-Ukraine conflict as Biden faces criticism at the G7 Summit on'Fox News Live.' JERUSALEM, Israel – President Biden's appearance at the NATO summit in Madrid on Tuesday presents the most serious test for his administration's effort to repair a fractured military alliance and roll back Russia's invasion of Ukraine. The United States government is widely viewed as the lead partner of the world's most powerful military body -- the 30-member North Atlantic Treaty Organization. Marshall Billingslea, a former NATO Assistant Secretary General, told Fox News Digital, "This NATO Summit is a crucial test for Biden's leadership. First, and most importantly, he must clear the way for Finnish and Swedish membership by brokering a deal with Turkey. Second, he has to get countries to deliver significant additional heavy weapons to Ukraine, particularly Germany, who has largely paid only lip-service to military aid."