The European Union’s new economic sanctions against Russia will go into effect Friday, for the country’s involvement in the Ukraine crisis. The U.S. is scheduled to outline to outline a new series of sanctions Friday. (Reuters)

The United States and the European Union announced stricter sanctions against Russia on Thursday, ratcheting up pressure against the country for its involvement in the Ukraine crisis as government and separatist forces on the ground struggle to maintain a tenuous, Kremlin-endorsed cease-fire.

The sanctions, which go into effect Friday, take aim at Russia’s energy sector and further constrict the country’s vital financial and defense industries’ access to global markets and resources. They strengthen measures that the United States and the E.U. instituted in late July to target key engines of the Russian economy after the downing of Malaysia Airlines Flight 17 over eastern Ukraine.

Western leaders threatened to step up sanctions in recent weeks after Russia was accused of sending military vehicles, weapons and troops into Ukraine to bolster separatist forces fighting the Ukrainian army in the eastern regions. Russian leaders have denied the accusation.

But the United States and the E.U. stressed that they stand ready to reduce or even undo the sanctions if Russia shows it is committed to the peace process in Ukraine and the continued implementation of a cease-fire agreement, struck last week in Belarus.

“We have yet to see conclusive evidence that Russia has ceased its efforts to destabilize Ukraine,” President Obama said in a statement announcing the new sanctions. “As I said last week, if Russia fully implements its commitments, these sanctions can be rolled back. If, instead, Russia continues its aggressive actions and violations of international law, the costs will continue to rise.”

A customer browses packets of fresh meat at a Metro Cash & Carry store in Moscow Friday. The tougher U.S. E.U. sanction on Russia are likely to hit shoppers’ pockets. (Andrey Rudakov/Bloomberg)

The U.S. sanctions, which will be detailed Friday, are expected to reinforce Europe’s measures.

The E.U.’s list of actions includes a blanket ban on services for deep-water and Arctic oil exploration and production, as well as for all shale oil projects in the Russian Federation. The sanctions also reduce Russian access to European capital markets by cutting from 90 days to 30 days the maximum maturity period of new loans and credits that Russian banks and businesses can obtain.

The E.U. also is adding five major state-owned banks, three defense companies and three energy companies to the list of Russian entities banned from obtaining financing in the European Union. The E.U. also plans to publish a list of 24 people involved in actions “against Ukraine’s territorial integrity,” bringing to 119 the number of individuals subject to travel bans and asset freezes.

Russia’s Foreign Ministry responded to the sanctions announcement by saying the E.U. “actually made a choice against the peaceful settlement of the Ukrainian domestic crisis.” Russian officials also warned that they would respond to the “new anti-Russian sanctions” in equal measure.

A report Thursday by the Russian state news service RIA Novosti cited an aide to President Vladimir Putin as suggesting that Russia’s response would include measures against nonagricultural commercial imports including cars — especially used cars — and textile products.