Ukraine has signed a document on joint production with the United States, involving several companies that focus primarily on the production of drones of various types, Ukrainian President Volodymyr Zelenskyy said. "Today we began our visit to Denmark with a very important meeting and an important document signing - this is a co-production between Ukraine and the United States of America. There will be several campaigns - they focus primarily, first of all, only on drones of different types,"