NATO Secretary-General Jens Stoltenberg "expressed NATO's full support for Ukraine's territorial integrity and sovereignty, including its full navigational rights in its territorial waters under worldwide law", according to a statement Monday.
The hostilities began when Russia blocked two Ukrainian military boats and one tugboat from sailing under a new Russian bridge spanning the Kerch strait, the channel that connects the Sea of Azov with the Black Sea to the south.
The move came after three Ukrainian navy ships made what the Russian coast guard has called an unauthorised crossing through "Russian territorial waters". The vessels did not react to orders of the border guards and were detained by the FSB Border Service.
But there is a hard balance to be struck between support for Ukraine's territorial integrity on the one hand and avoiding anything that might tip the conflict into full-scale war. Canada's foreign minister, Chrystia Freeland, said her country also condemned what she called Russian aggression and demanded Moscow release the flotilla.
We will remind, the United Nations, the tires at the Embassy and the criminal case: a chronicle of the Russian attack in the sea of Azov.
North Atlantic Treaty Organisation called an emergency meeting with Ukraine on Monday after the alliance's head Jens Stoltenberg held a phone call with Poroshenko. Ukraine provided Allies with detailed information on the incident yesterday.
In September, Kiev announced plans to establish a naval base on the Azov, and Washington has said it is mulling more military assistance for Kiev to counter Russia's actions.
Russia and Ukraine have also been locked in conflict since the annexation of the Black Sea peninsula of Crimea by Russia in 2014, and a war with Russian-backed separatists in the country's east has claimed more than 10,000 lives. Russian media said that only three Ukrainian sailors were slightly hurt.
Russian seizure of Ukrainian naval ships off Crimea sparks alarm
"The big story here is that Russia's armed forces, in broad daylight, launched an attack on Ukrainian navy ships".
The FSB accused the Ukrainian navy of staging a provocation against Russian Federation.
Part 1, Article 36 of the UN Convention states that in the straits referred to in Article 37 of the UN Convention, all ships and aircraft shall enjoy the right of transit passage which shall not be obstructed.
Since President Vladimir Putin earlier this year opened the new bridge across the Kerch Strait - connecting the Russian mainland to Crimea - Moscow has increased its control of the area.
At this time Russian Federation closed Kerch strait with a "grounded" tanker at the bridge from Azov Sea side.
Lavrov called the incident a "clear provocation" by Kiev and accused the European Union of "blind support" for Ukraine.
Mr Poroshenko said martial law was necessary because of intelligence about "a highly serious threat of a ground operation against Ukraine".
The Ukrainian ships were on a journey through the Black Sea, having left the Ukrainian port city of Odessa and heading to Mariupol on the Azov Sea coast, the government-controlled Ukrainian city that is closest to the breakaway regions of Donetsk and Luhansk. He also said it should be accompanied by a "termination of relations" with Russian Federation.
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The group's global director, Stephen Corry, called the incident a "tragedy" that "should never have been allowed to happen". He had earlier visited the Andaman and Nicobar Islands in 2015 and 2016, Pathak said.