President Joe Biden informed G7 leaders on Friday that the US will support a joint effort with allies and partners to train Ukrainian pilots on fourth generation aircraft, including F16s, a senior administration official tells CNN.

The training is not expected to happen in the US, the official said, and will likely happen entirely in Europe. But US personnel will participate in the training alongside allies and partners in Europe, the official said. It is expected to take several months to complete.

CNN reported on Thursday that the Biden administration has signaled to European allies in recent weeks that the US would allow them to export F-16 fighter jets to Ukraine, sources familiar with the discussions said, as the White House comes under increasing pressure from members of Congress and allies to help Ukraine procure the planes amid intensifying Russian aerial attacks.

A spokesperson for UK Prime Minister Rishi Sunak said earlier this week that the UK and the Netherlands were looking to form an "international coalition" not only to procure the jets for Ukraine but also to train Ukrainian pilots on the 4th generation fighters, which are more advanced than the Ukrainian fighter fleet.

This story is breaking and will be updated.