** Shares of some U.S. drone companies rise in premarket
trading
** Unusual Machines UMAC.A shares up 15%, Red Cat
Holdings RCAT.O adds 8%, Aerovironment AVAV.O gains 3%
** Other firms including Aureus Greenway Holdings PUSA.O
adds 5.2%, Kratos Defense & Security Solutions KTOS.O advances
1.5%
** U.S. President Donald Trump said on Thursday he will
impose tariffs on imports of drones and their components,
including from some key U.S. allies
** Tariffs will take effect in 21 days, the White House said
** For components of drones that are not particularly
sensitive, the tariffs will take effect 180 days after signing,
it said
(Reporting by Sudeshna Ghoshal in Bengaluru)
((Sudeshna.Ghoshal@thomsonreuters.com;))