No country in the world is save from this attack if it happens.
Earth is now very developed than ancient times, lot of countries have good defense system but no one have any solution for asteroids approaching the Earth. According to NASA about 100,000 pounds of material fall on Earth every day.
This estimated material is mostly small rocks but there are asteroids those can demolish the whole city or even a planet if they struck with it. Scientists said that there is no protection against asteroids and if 165 feet asteroid hits the Earth it would be enough to destroy the whole city and kill about millions.
In 2013 a asteroid of about 65 feet hit in Russia and hit the ground and its response make people to knock off thier feet and whole factory collapse down injuring about 1200 people. Why no one have seen this big massive mass coming towards Earth. It could easily be turned down with Anti-Missile technology.
So countries have to think about this matter because from last couple of years few asteroids comes very close to Earth and it is a big danger for whole mankind.