Insights from leaked Pentagon documents on Russia-Ukraine war and U.S. spying.

The US Defense Secretary has promised to find the source of the leak of sensitive Pentagon documents, including intelligence about the war in Ukraine. Meanwhile, Ukrainian forces are testing Russian defenses in search of vulnerabilities ahead of their spring counteroffensive, which has been delayed by weather, slow equipment deliveries, and ammunition scarcities. Ukrainian officials have framed the counteroffensive as decisive, but fears of a stalemate remain. The European Parliament is meeting with lawmakers from Kyiv regarding Ukraine's potential accession to the European Union.