Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Putin Warns Ukraine Against Committing any 'Reckless Acts' by Margaret Besheer Russian President Vladimir Putin is warning Ukraine against committing any "reckless acts" as Ukraine imposed martial law after Russian forces seized three Ukrainian ships and their crews in the Black Sea. In a phone conversation with German Chancellor Angela Merkel, Putin said he was "seriously concerned" about the developments and asked Germany to approach Ukrainian authorities "to dissuade them from further reckless acts," the Kremlin said. The Kremlin had previously warned the imposition of martial law could lead to a flare up in hostilities in eastern Ukraine. President Petro Poroshenko said martial law will help "strengthen Ukraine's defense capabilities amid increasing aggression and according to international law a cold act of aggression by the Russian Federation." Ukraine's parliament voted Monday to approve martial law in 10 of the country's 27 regions beginning Wednesday. The measure calls for 30 days of martial law, an apparent concession to opponents, which would allow for elections to be called as scheduled in December. Russia fired on two Ukrainian naval ships and rammed a third vessel Sunday in the Black Sea, seizing the ships and accusing them of illegally entering its territorial waters. U.N. Secretary General Antonio Guterres urged Ukraine and Russia Tuesday to exercise "maximum restraint" to avoid further escalation in the region. U.S. Ambassador to the United Nations Nikki Haley condemned Russia for its "outrageous violation of sovereign Ukrainian territory." "This is no way for a law-abiding civilized nation to act," Haley said at a Monday emergency meeting of the U.N. Security Council. "Impeding Ukraine's lawful transit through the Kerch Strait is a violation under international law. It is an arrogant act that the international community must condemn and will never accept." At the U.N. Security Council, most members condemned the escalation, urged restraint and called for the unconditional and immediate release of the Ukrainian sailors and the return of their ships. Poroshenko is demanding Russia immediately release the Ukrainian sailors and ships. NATO head Jens Stoltenberg also called on Russia to release the Ukrainian navy ships, saying "there is no justification" for Moscow's actions, while European Union chief Donald Tusk condemned Russia's use of force and reiterated the EU would stand in support of Ukraine. Russian Foreign Minister Sergey Lavrov accused Ukraine of violating international norms with "dangerous methods that created threats and risks for the normal movement of ships in the area." Russia's deputy envoy Dmitry Polyanskiy blamed Kyiv and its western supporters for the escalation. "This provocation was pre-planned, that's obvious, and it was with the full connivance of Western states that de facto have just given carte blanche to any actions taken by their subordinates," he said. Ukraine's U.N. ambassador, Volodymyr Yelchenko, said his government would like to see a tightening of economic sanctions on Moscow. "The sanctions is the only real tool that can make Russia at least start thinking of their behavior," Yelchenko said after the meeting. "Sanctions, they do bite." Ukrainian officials say at least six sailors were wounded in the incident and denies any wrongdoing. "We think our sailors committed no crime whatsoever," Ambassador Yelchenko said, noting that Crimea is not recognized as Russian territory by anyone except Russia. "What are they claiming, that Ukrainian sailors committed a crime by crossing the Russian border? Where is this border? It does not exist." Russia's deputy U.N. envoy appeared to signal the Ukrainian sailors would not be released quickly and could face a trial. "The three sailors, they were acting in provocation and they were conducting a crime according to the laws of the Russian Federation," Dmitry Polyanskiy told reporters. "Each and every sovereign country has [a] right to prosecute people who conduct crimes and unlawful acts on their territory, that's our approach. Sunday's incident began when a Ukrainian tugboat set out to escort two navy ships from Odessa, on the Black Sea, through the Kerch Strait to the Ukrainian port of Mariupol, in the Sea of Azov. The Kerch Strait is the only passage between the two seas. Ukraine said Russia used a tanker to block access to the Kerch Strait, which under a treaty is shared territory. The Trump administration has previously warned Russia against trying to strangle the Ukrainian economy by harassing international shipping through the Kerch Strait. Russia forcibly annexed Ukraine's Crimea Peninsula in 2014, claiming its ethnic Russian majority was under threat from the Ukrainian government. Fighting between pro-Russian forces in eastern Ukraine and Ukrainian troops has eased in recent months, but there are still occasional deadly flare-ups. Russia has consistently denied sending weapons and fighters to help the separatists, despite strong evidence to the contrary.