The two nations were quick to point fingers. Ukraine maintained its ships were heading to the Sea of Azov in line with international maritime rules, while Russia's foreign minister said Ukraine has violated international law and elicited the attack by sending its vessels through the Kerch Strait without permission.
Poroshenko called an emergency meeting with the Defense and Security Council in Kiev in which he suggested enforcing martial law for 60 days following Sunday's incident, Bloomberg reported.
The European Union has called for restraint, while NATO said it was monitoring the situation, according to the report.
The Associated Press contributed to this report .
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A ship under the the Kerch bridge blocks the passage to the Kerch Strait near Kerch, Crimea.