Kyiv's forces must contend with the unpredictability of the US president, who, while retracting his offer to supply Tomahawk missiles, has since the summer increased intelligence support, enabling for more effective strikes on Russia's energy infrastructure.

Ukraine's leader, who is seeking US-made Tomahawks, says Russia has launched a new wave of 'air terror'.

US president has repeatedly hinted at supplying Kyiv with Tomahawks, but some in Moscow say Kremlin sees it as negotiating gambit