Russia agreed to return to Ukraine three naval vessels seized following an attack on them near the Kerch Strait in November 2018.

That's according to a Russian news outlet Kommersant, citing its source.

The parties are now agreeing on the place and time of transfer of the three boats, the source said.

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The issue should be resolved before the Normandy Four summit, which is scheduled for December 9.

Read alsoU.S. calls on Russia to immediately return Ukraine's naval ships seized in Nov 2018

Two informed sources confirmed that a decision was made on principle to return to Ukraine the small armored boats Berdyansk and Nikopol, as well as the tugboat Yany Kapu.

According to them, Russia and Ukraine are now at the final stage of negotiations involving law enforcement agencies and foreign ministries of the two countries.

Sources say the vessels will be towed to the sea where they are supposed to be met by Ukrainian tugs at a designated location.

Personal weapons of Ukrainian crew, as well as radios and logs containing information on the crew and other data, will remain in Russia, the report claims.