Polish president says apparent missile strike in Poland was 'isolated incident,' but notes the 'North Atlantic Alliance is on standby'- President Andrzej Duda of Poland said his government doesn't yet conclusively know who fired a missile that struck Polish territory late Tuesday, killing two civilians.- The explosion, which took place near the Ukraine border, came as Russia was launching a massive wave of missiles at Ukrainian cities and energy facilities just before dusk.Our planes will be supported by allied planes.We act calmly and prudently."'Harden the resolve'Mick Ryan, an adjunct fellow at U.S.-based national security research organization CSIS, said in a Twitter post that it's unlikely Russia or NATO would use the strikes in Poland as a pretext for widening the war."