PARIS, June 3- France and India will seek to show a united front to tackle climate change when the their leaders meet on Saturday with President Emmanuel Macron likely to underline his country's stability in talks with Prime Minister Narendra Modi.Modi's arrival in Paris comes after US President Donald Trump announced his decision to withdraw from the 2015 Paris climate agreement and at a time when uncertainty in the European Union prevails following Britain's decision to leave the 28-nation bloc."Climate will obviously be one of the first topics discussed. It's a personal commitment from Modi so it's crucial that this engagement is reiterated in the current context," said a senior French diplomat.Modi, whose country is the world's third-biggest emissions generator, said in Russia on Friday that he would continue to back the deal. Macron's call on Thursday for the accord's remaining 194 countries to fill the void left by the US may see the two sides push for greater cooperation."Trump's decision is very bad news, but we have to move on with world's key actors, starting with India," said the diplomat. "We need to show that we are stable, not unpredictable and have convictions that we aren't afraid to stick to."