Britain, the U.S. and the European Union have imposed a range of sanctions since last February to punish Russia for its invasion of Ukraine, which Moscow calls a "special military operation."
The British government set out 25 new sanctions on individuals and businesses in Iran, Turkey, Belarus, Slovakia, Switzerland, the UAE as well as Russia.
"Today's landmark sanctions will further diminish Russia's arsenal and close the net on supply chains propping up (President) Putin's now struggling defence industry," British foreign minister James Cleverly said.
Iranian drone maker Paravar Pars and seven of its executives, already subject to U.S. sanctions announced in February, and two Turkey-based exporters of microelectronics were among those targeted by Britain.
The sanctions prohibit UK entities from providing trust services - the creation of a trust or similar arrangement - to those sanctioned and also impose asset freezes, which block their assets held in the UK.
The British government, which has sanctioned over 1,600 individuals and entities since the start of the Ukraine conflict, said the latest round of sanctions marked its biggest ever action on military suppliers in third countries.
(Reporting by Sachin Ravikumar, writing by Muvija M; editing by William James)
