We begin in Helsinki, where security is being tightened ahead of US President Donald Trump's meeting with his Russian counterpart Vladimir Putin in the Finnish capital on Monday. Our correspondent Guy Henderson reports. 

GUY HENDERSON HELSINKI, FINLAND "We're standing in Helsinki harbor at the moment where there are growing signs of what's to come here in the next few days. After that we understand there is a possibility of joint press conference and it is only then we will know whether they have any significant outcome from their discussion which  some say as a historical opportunity for this two leaders to reset ties between their countries, at least start conversations about several issues in Syria, in Ukraine and on nuclear proliferation. Guy Henderson CGTN, Helsinki."