Reported attacks in the last few days have left a Russian warship partially submerged and leaning to one side, and Ukraine's fleet of sea drones are thought to be responsible.
Drones tend to be relatively small and therefore have limited capacity to carry a large explosive charge, Mr Bell says.
"In some respects, drones are like wasps disrupting a summer BBQ - they are unlikely to cause any lasting damage, but they can be a major distraction to the main effort."But he added that wars can also be won by destroying the enemy's will to fight rather than purely through victory on the battlefield.
"Attacks on Russian territory and on high-profile targets - such as the Black Sea Fleet - all increase pressure on the Russian president."Fire crews tackled a fire in the city of Starokostiantyniv, about midway between Kyiv and Lviv.War generally brings a drive to innovate new and more efficient weaponry, and the conflict in Ukraine over the past year-and-a-half has been no different.
He gave the example of the UK's flagship Queen Elizabeth-Class aircraft carriers, which cost around £1bn each.
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