U.S. President Joe Biden has called on U.S. citizens to leave Ukrain quickly amid ongoing tensions. He says the situation could “get worse very quickly.” And if Moscow invades Ukraine, it will not be able to send troops to rescue the Americans. “Americans should leave now,” Biden told. We are dealing with one of the largest armies in the world. This is a very different situation and the situation could get worse soon. ”

Biden said “If America and Russia start firing at each other, it will be a world war. We are in a world very different from before. ”

The U.S. State Department has also called for the immediate evacuation of U.S. citizens in the country as tensions with Ukraine continue to rise. The Kremlin says Russia wants to use the “red line” to ensure that former Soviet neighbor Ukraine does not join NATO. The Prime Minister of the United Kingdom Boris Johnson has said that Europe is facing its biggest security crisis in decades.

Russia already had said it has no plans to invade the neighboring country, despite deploying more than 100,000 troops along the Ukrainian border. However, many Western nations, including the United States, have speculated that Moscow may launch an attack on Ukraine at any moment.