The Permanent Court of Arbitration will in June hear Russia's objections against a move by Ukraine to drag it before the world' oldest arbitration body over rights to coastal waters around annexed Crimea.

Russia snatched the Black Sea peninsula from Kiev in 2014 and was being accused by the West of illegally blocking access to the Sea of Azov, used by both Russia and Ukraine.

Kiev in September 2016 dragged Moscow to the Hague-based PCA, saying it instituted arbitration under international maritime laws "to vindicate its rights as the coastal state in maritime zones adjacent to Crimea in the Black Sea, Sea of Azov and Kerch Strait."

It asked the arbitral tribunal to "enforce its maritime rights by ordering the Russian Federation to cease its internationally wrongful actions in the relevant waters."

Moscow in turn indicated it would submit its objections in the case to the PCA, with a public hearing scheduled for June.

"The opening statement of the Russian Federation will be delivered on Monday, 10 June at 10 am (local time)," the PCA said in a statement Tuesday.

Ukraine's opening statement will be delivered a day later, it added.

Russia in November fired and seized three Ukranian navy vessels, capturing dozens of sailors near the Kerch Strait, as they tried to pass from the Black Sea to the Azov Sea.

The incident was the first open military clash between Kiev and Moscow since 2014, when the Crimea was annexed and a pro-Russian insurgency erupted in eastern Ukraine.

NATO chief Jens Stoltenberg earlier this month said the alliance planned to address "the aggressive actions of Russia" in the Black Sea.

Kay Bailey, the US ambassador to NATO added that allies would send more ships to the area to ensure that "countries in and around the Black Sea are safe from Russian meddling."

Moscow in turn criticised the Black Sea plan, saying it regretted that the alliance "has no intention to renounce its political and military confrontation with Russia" asking instead to de-escalate "military and political tensions."

Set up in 1899, the PCA is the world's oldest arbitral tribunal and resolves disputes between countries and private parties through referring to contracts, special agreements and various treaties, such as the UN Convention on the Law of the Sea.

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