UN Countries USA, UK, France, China and Russia all want wakanda's raw resources. The world is low on resources, the lowest that it has been, but wakanda has all the most valuable things most notably vibranium. Wakanda has all the things those countries need. The 5 countries know how advance wakanda is so they all invade all at once, They play to take over wakanda and take all its resources.
black panther then prepares for war!
Both groups have 17 days of prep. No heros such as the avengers, xmen,FF,etc can get involved. The UN can use tatical nukes if things get messy. Can the most advanced nation on earth take on the combined might of the five most powerful nations in the UN?