The last day in Nov. An international conference on planet change known as top 21 give started today in the French capital. Almost 150 world leaders are expected to be there, the main goal, an international deal to limit greenhouse gas emission across the globe, because the recent terrorist attack in Paris, French government has dramatically increase security . It's banned large gatherings like a massive environmental marge that was planned for Sunday. They had their protest, some peaceful, some not. More than 200 people were arrested yesterday for fighting with police. Supporters of the conference said moving ahead is abuse of terrorism, critic say the climate is not their main concern.                                                     I'm not convinced about the necessity at this moment to organize this event, i think we have other priority today even the environment is very important. President Obama flew to Paris last night he hoping to make climate change action a significant part of his presidential legacy,but it turned clear how much he can do without the support of the US congress. A major incident involving Russia and Turky happened over the break. We've told you how Russia were playing are conducting air attack in Syria. Russia supports that country's government, Turkey opposes it.Last Tuesday, a Turkey fighterjet shotdown a Russia one,the two Russia pilots ejected, only one survived. Turkey said the Russian plane had violated Turkey's airspace, Russia said it didn't. Turkey said it gave the Russian plane mopable warning before it was shotdown, Russia said it didn't. Russia said the plane was targeting ISIS' terrorists, Turkey said none was in the area. One thing that was for certain, the incident is changing the dynamic of international military involvement in Syria's civil war.

This is what worries US pilots right now.The Russian,s400 anti-air missile system being unloaded in Syria. Russia president Buladia Putin says this massive weapon system will protect his piolets and aircraft in the way of Turkey shooting down a Russian jet. We need to have security for our airforce and that is why we have set up the modern system-S400. This is one of most effective and efficient systems in the world. If S400 system will give Russia enough capability to control hundreds of miles of Turkey and Syrian airspace, the Pandigan doesn't believe the system is fully operational yet, but it's watching the development by the hour. A US military official tells CNN.

If the Russian activated,US warplace may have to start trying with specialized electronic canning their craft to protect themselves or even forgo some airstrike. US official tells CNN they need an agreement on how to proceed before the system is activated.