A Russian missile strike on port infrastructure in Odesa in southern Ukraine killed eight people and wounded 27, Ukraine's emergency service said Saturday, as a a Kremlin envoy was set to travel to Florida for talks on a U.S.-proposed plan to end the nearly four-year war.

Ukrainian "Sub Sea Baby" drones critically damage Russian submarine equipped with Kalibr cruise missiles in Novorossiysk, the Security Service said.

A video of the attack on Novorossiysk with the Sub Sea Baby drone shows a calm port with several ships before a massive explosion kicks up water and debris.

Russia attacked the southern Ukrainian port of Pivdennyi on Saturday, Ukrainian officials said, as it ramped up strikes on the Odesa region along the Black Sea including energy facilities and a critical route to the Moldova border.

Ukraine claims it has carried out the first successful combat strike by an underwater drone against a submarine, damaging a Russian Kilo-class boat in the Black Sea port of Novorossiysk and potentially removing a key cruise missile launch platform from the war.

Ukrainian security services have stepped up drone and sabotage operations against Russian combat aircraft and submarines this month, in what analysts see as one way to combat incessant Russian missile strikes against cities and energy infrastructure.

Ukraine has struck a Russian "shadow fleet" oil tanker in the Mediterranean Sea with aerial drones for the first time, an official said on Friday, reflecting the growing intensity of Kyiv's attacks on Russian oil shipping.

Eight people were killed and 27 wounded in a Russian missile strike on port infrastructure in Odesa, southern Ukraine, late on Friday, Ukraine’s Emergency Service said.

Ukraine’s domestic security service, the SBU, said Monday that it struck a Russian submarine in the Black Sea port of Novorossiysk, causing critical damage to the vessel and effectively disabling it.

Ukraine's internal security agency said the attack damaged and disabled a Russian Kilo-class submarine in the port city of Novorossiysk.