Putin said the incident, which ended in Russia's seizure of three Ukrainian ships and Kiev imposing a partial martial law in the country, was a "dirty game" by Poroshenko, who needs to suppress his political opponents ahead of the March presidential election.
The episode risks derailing a meeting between U.S. President Donald Trump and Russian President Vladimir Putin at the G20 in Argentina later this week.
"We had information that after this provocation Russian regular forces could go for more aggressive actions against Ukraine.This is why Ukraine's authorities chose to impose martial law", Parubiy says. In response to reporters' questions, the President said he was "not happy about it at all", then indicated he might see fault on both sides, saying, "we do not like what's happening either way". The president is in fifth place ratings-wise and therefore had to do something.
Sources in Russian security services had said in September that a fourth system would be deployed in Crimea near Dzhankoy, a town close to Ukrainian-controlled territory.
The United States and the European Union have both imposed sanctions on Russia over its conduct towards Ukraine since 2014, when Moscow seized and annexed Ukraine's Crimea peninsula after a pro-Russian leader was toppled in Kiev.
Some of Ukraine's Western allies have also raised the possibility of imposing new sanctions on Russia over the episode, which could deliver a blow to the Russian economy.
Putin voiced concern about the decision to impose martial law and told German Chancellor Angela Merkel he hoped Berlin could influence Ukraine to avoid any "reckless acts".
Ukrainian president warns of threat of 'full-scale war' with Russia
"We don't have any other information from [U.S. officials]", he said when asked about Trump's comments.
North Atlantic Treaty Organisation on Tuesday emphasized its "full support to Ukraine's sovereignty and territorial integrity", noting there is no justification for Russia's use of military force against Ukrainian ships.
The meeting is expected to be focused on arms control negotiations, among other topics, but after Russian Federation had a naval clash with Ukraine last week, Trump told the Washington Post their planned meeting is up in the air.
Earlier Wednesday, the Russian military announced it would be boosting the defenses of the occupied Crimean peninsula with more anti-aircraft missiles in the wake of the standoff. Over the last year, the two countries have levied a series of tariffs on hundreds of billions of dollars of imports from one another, with the latest round of USA duties set to go into force in the new year. On Tuesday, the court ordered 15 of their compatriots to stay behind bars for the next two months.
Sunday's incident was the first direct confrontation between Ukraine and Russia in the long-running conflict pitting Kiev against Moscow and Russian-backed separatists in the country's east.
Ukraine will defend itself militarily if it has to against "Russian aggression" along the country's coastline in the sea of Azov, the country's foreign minister has told Sky News.
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