The PM rejected the move on grounds it would be disastrous for the Hungarian economy, but made clear he is willing to negotiate.
It will be one of the UK’s largest deployments to Europe since the cold war, with the US and other western European nations also stepping up military drills and support to Ukraine.
At least five civilians were killed and 23 injured, as security services and journalists record the aftermath.
With both nations dependent on Russian gas supplies for over 50% of their national consumption, the move will likely draw legal challenges over violations of existing contracts.
The Kremlin has warned against the flow of Western arms into Ukraine, and retaliation should such attacks materialise.
Veteran reporter Matt Lee’s questioning highlights that the US is unable to provide evidence to substantiate claims of a false flag event being orchestrated in Ukraine by Russia.
In the event of a military escalation in Ukraine, Milanovic has threatened to withdraw Croatian forces, causing disagreements amongst the Croatian government.