Russian President Vladimir Putin yesterday in a press conference said that the FSB on the border of Russia and Ukraine detained a group of Ukrainian saboteurs. Russian President promised to give a harsh response to Ukraine and not "ignore" the death of the Russian military at the hands of Ukrainian saboteurs. In turn, the Ukrainian side is headed by the President Poroshenko denies Ukrainian law enforcement agencies to attempt to organize terrorist attacks in the Crimea and the death of Russian soldiers.
We believe that now is a high probability of Russia can give a harsh response to the economic and Ukraine. Recall that in January 2016, Russia imposed an embargo against Ukraine in the food supply, as against the EU countries that supported the anti-Russian economic sanctions. In response, Ukraine introduced its own embargo on certain food products from Russia are not covered by the Russian prodembargo, which include, in particular pet food and chocolate.
Now Russia, new measures are necessary. In particular, one of them could be to limit the supply of oil (for some types of petroleum restrictive measures already exist), and especially natural gas to Ukraine. There are also personal sanctions against Ukrainian oligarchs (including against Poroshenko himself) with industrial and financial assets in Russia and especially in the Crimea.