Russia's top diplomat has warned that NATO is now fighting a proxy war with Russia in Ukraine and there is a 'very serious' risk the conflict could turn nuclear.

In a major reversal following Chancellor Olaf Scholz only days ago voicing strong resistance, it appears Berlin has bowed to the mounting pressure among allies and approved new tank deliveries to Ukraine from Germany's own stock, which Scholz had previously said was depleted.

The director of the C.I.A. said on Thursday that “potential desperation” to extract the semblance of a victory in Ukraine could tempt President Vladimir V. Putin of Russia to order the use of a tactical or low-yield nuclear weapon, publicly discussing for the first time a concern that has coursed through the White House during seven weeks of conflict.

At a moment the Pentagon has vowed to "speed up" weapons deliveries to Ukraine forces, and after Slovakia announced early this week it is in discussion with NATO allies to provide Kiev with MiG-29 fighter jets, the Kremlin has repeated its warning that any weapons shipments entering the country will be viewed as "legitimate military targets".