Mr. Klimkin issued the extraordinary warning during an interview with Sky News. It follows the seizure of three Ukrainian ships by Russian forces on Sunday in the Sea of Azov off the coast of Crimea. A total of 24 Ukrainians were also captured, three of whom are recovering in hospital after being injured.
Mr. Klimkin warned: “In the event of a Russian attack on the Azov coast, we are not only ready to act militarily, we will fight for our independence, for our territory and our freedom.
“We will all fight against Russian aggression.”
A court in Crimea, occupied by Russia since 2014, accused several of the men of entering Russian territory illegally and ordered their detention for two months.
Russian security agency FSB posted videos of three of the men apparently confessing to having deliberately entered Russian territorial waters.
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Ukrainian navy chief Ihor Voronchenko claimed that the statements, which appeared to have been read from a script, were prepared for the sailors by their captors.
Foreign Minister Pavlo Klimkin added that Russia is strengthening its forces in the region and called for “solidarity” from Ukrainian allies in the event of further aggression.
He said: “We should ask all of our friends and partners to put more pressure on Russia and put more sanctions, just to fundamentally increase the price of this action. “
He admitted that Ukraine would find it difficult to prevent Russian forces from closing the Kerch Strait, which separates Crimea from Russia, due to its “limited naval potential”.
In response to the clash, the Ukrainian government declared martial law for a period of 30 days.
According to a 2003 agreement, the Sea of Azov is a territorial water shared between Russia and Ukraine.
United Nations Secretary-General Antonio Guterres has urged both sides to show “maximum restraint” to avoid escalation.
In 2014, Russian forces launched a major intervention in Ukraine after the sympathetic Ukrainian president of the Kremlin was ousted by protesters in February.
Russian troops seized the Crimean Peninsula and supported separatist fighters in eastern Ukraine, who organized themselves into two pro-Russian microstates based around the cities of Donetsk and Luhansk.
The intervention sparked a major conflict, with sporadic violence continuing today.
In July 2014, a Malaysian Airlines flight over eastern Ukraine was shot down.
A joint investigative team discovered that the responsible missile launcher came from Russian territory and returned to Russia shortly after the incident minus a missile.