In today's episode of Faultlines, US President Donald Trump on Tuesday said Vladimir Putin was "playing with fire" by refusing to engage in ceasefire talks with Kyiv as Russian forces made gains in Ukraine's northeast. Meanwhile, after the 5th round of nuclear talks with the US concluded over the weekend, Iran has declared that it is capable to survive even if the negotiations fail - an option that is non-existent from Donald Trump's perspective. NDTV's Gaurie Dwivedi decodes.