(Reuters) - The conflict in Ukraine is taking a heavy toll on some of Russia's most capable units and most advanced capabilities, the British Ministry of Defence tweeted in a regular bulletin on Saturday.

       At least one T-90M, Russia's most advanced tank, has been destroyed in the fighting, the ministry said.

       Approximately 100 T-90M tanks are in service amongst Russia's best equipped units, including those fighting in Ukraine, it said.

       (Reporting by Shivam Patel in Bengaluru; Editing by William Mallard)