U.S. President Joe Biden reiterated in his first state of the Union speech in Congress on the 1st that the U.S. military will not enter Ukraine to fight with Russian forces. Biden first mentioned the military conflict between Russia and Ukraine in his speech that night, emphasizing that the US military will not enter Ukraine to fight with the Russian army now and in the future. In his speech, Biden reviewed a series of "strong" economic sanctions recently implemented by the United States and its allies and partners against Russia, as well as the military, economic and humanitarian assistance provided to Ukraine, saying that the relevant measures showed the unity of the West and brought "pain" to Russia. Biden said that the U.S. Department of justice will set up a working group to investigate the "criminal acts" of Russian oligarchs and confiscate their yachts, luxury houses and private aircraft together with European allies. At the same time, the United States will continue to provide assistance to the Ukrainian people to resist Russian military operations. Biden also said that the United States would prohibit Russian aircraft from entering US airspace. The purpose of this move is to "further isolate Russia and further suppress the (Russian) economy". European Commission President von delaine announced on February 27 that Russian aircraft were prohibited from taking off, landing or crossing in EU airspace. On the same day, Canada also announced the closure of its airspace to Russian aircraft. In response, Russia announced on the 28th that it would impose restrictions on flights in Russian airspace operated by airlines from 36 countries, including Canada and many European countries. (Xinhua News Agency)