The 28 member state ambassadors to the EU targeted "persons and entities supporting or benefiting from (the actions of) Russian decision-makers" in Ukraine, said one official yesterday, who asked not to be named.
The ambassadors also agreed to "target further entities responsible for action against Ukraine's territorial integrity," the official said.
Trade and investment with Crimea, annexed by Russia in March, would be further restricted, the official added.
EU diplomats said separately that one name had been agreed and three others were under discussion, while perhaps three entities would figure on tomorrow's list.
Also Read
Previously, the EU has hit members of Putin's political inner circle, including Deputy Premier Dmitry Rogozin, but this would be the first time they have targeted business figures close to the president.
On Saturday, the EU ambassadors hit 15 individuals and 18 entities - including Russia's intelligence chiefs - with asset freezes and travel bans.
The ambassadors, who meet regularly, are due to meet again today to approve the next move, to "Phase 3" sanctions covering four key areas - access to capital markets, defence, dual-use goods and sensitive technologies, including in the energy sector.
Up to now, the EU has been reluctant to take this step because many member states, such as Italy and Germany, have major economic ties with Russia which they feared could be harmed by tougher sanctions.
The new economic-sector measures to be agreed today will limit access to the long-term capital markets, making it more difficult for Russian state-owned banks to raise fresh funds and putting the faltering economy under even more pressure.