The measures will affect the energy, defense sectors and Moscow's ability to mobilize its financial assets. "Biden's message to the G7 is that the alliance is stronger and more united than ever on a range of crucial issues," said a senior US administration official in a virtual briefing from Japan.

"The G7 will announce new sanctions to isolate Russia economically," said the official, specifying that the price cap on Russian oil will be maintained. The measures will be announced at a G7 meeting in Washington on May 18.