Russian President Vladimir Putin committed in a phone call with U.S. President Donald Trump to limit Russian attacks on Ukrainian energy assets but declined to agree to a broader 30-day ceasefire as the U.S. had sought.

Putin and Trump agreed to “an energy and infrastructure ceasefire” and to begin negotiations on a “maritime ceasefire in the Black Sea, full ceasefire and permanent peace,” the White House said in a statement after the two spoke by phone for more than 90 minutes. The talks will begin “immediately” in the Middle East, the White House said, without saying who would lead the negotiations.