ISTANBUL, Sept 2 - Tankers and cargo ships are transiting the Bosphorus strait adorned with nets, water tanks and tyres to try to fend off growing Russian and Ukrainian drone strikes in the Black Sea, according to security experts and video obtained by Reuters.

In a stark illustration of the risks, the abandoned Russian-flagged cargo ship Omskiy-107 - its command deck burned out - drifted from Russian waters to a northern Istanbul beach east of the Bosphorus, one of the world's busiest shipping routes.

Ukraine has stepped up attacks on ships and infrastructure facilitating Russian oil and grain exports since July, when Russia intensified its missile and drone strikes on the main Ukrainian grain export hubs of Odesa, Chornomorsk and Pivdennyi.

The Caruzo, a Sierra Leone-flagged crude oil tanker, transited the strait on August 11 with water tanks dangling around its stern, apparently in an effort to cushion any attack and prevent damage to the engine room. Khrizopraz, a Russian-flagged crude oil tanker, had tyres hanging over the hull when it passed on August 27.

MEASURES CAN WORK IN SOME CASES BUT NOT ALL, EXPERT SAYS

The scale of attacks from Russia and Ukraine on commercial ships and port infrastructure has increased sharply and may rise further, said Corey Ranslem, chief executive of maritime security group Dryad Global.

"There's a couple of popular countermeasures that we've seen onboard vessels that are transiting in Black Sea operations," he said, mentioning water-filled containers and another method involving nets.

The latter, increasingly common method of protection is known as 'cope cages' - netting to protect the ship's superstructure from explosive drones. Two crude oil tankers, Brisk and Integrator, both had such protection last month when they passed through the Bosphorus.

"These tools can be effective for some of the smaller types of drones but when you look at the bigger military types of drones these tools may not be as effective, or in some cases, effective at all," Ranslem said.