covert

Israel claimed that Iran was still pursuing a covert nuclear programme, and warned that Iran would use billions of dollars in sanctions relief to strengthen its military activities.

There was also covert monitoring of the business, which revealed unrefrigerated chicken deliveries to west Wales and a van dumping waste at a tip before being reloaded with food without being cleaned.

Israel has repeatedly accused Hamas of using hospitals as covert bases and for storing weapons, which the group denies.

Even today, several of the current far-right parties in Europe receive covert or overt assistance from Moscow.

Such covert methods take time, however, and could lead to potentially fatal delays of days or weeks.