Though US wants France to delay or scrap €1.2 billion contract, French officials say ending contact would harm Paris more than Moscow.
French president says deal over sale of two Mistral warships was signed back in 2011 and will be completed in October despite Ukraine crisis.
France's Francois Hollande and German chancellor Angela Merkel hint at tougher sanctions if presidential elections on May 25 do not take place.
In visit to Moscow, Marine Le Pen says it is the European Union that declared 'cold war' on Russia by seeking closer ties with Ukraine.
US Secretary of State John Kerry tells press conference that there was no breakthrough after four hours of talks with his Russian counterpart.
The US Secretary of State and Russian foreign minister Sergey Lavrov are to meet on Sunday in an effort to defuse tensions in current standoff.
France will also offer to send four fighter jets to Baltic states to boost NATO air patrols over the region should the military alliance request them.
Foreign minister Laurent Fabius says £1bn contract for two high-tech Mistral warships could be blocked if situation escalates.
Foreign minister Laurent Fabius warns measures against Russia could kick in soon if Moscow does not respond to Western proposals to solve crisis.
The troop, tank and helicopter carrier is part of a 1.2-billion-euro deal, the biggest-ever sale of NATO weaponry to Moscow, agreed in 2011.
US state secretary John Kerry and Russian counterpart Sergei Lavrov held their first face-to-face talks, which are to continue over coming days.
The French actor was given a standing ovation for his performance in the American play Love Letters at the Theatre Antoine in Paris.
Francesco Pisanu and eight other activists granted bail were among 30 arrested for a protest against Arctic drilling at an offshore Russian oil rig.
The man suspended himself in a tent from the second floor of the monument in protest against Russia's detention of 30 of the group's members.
French company denies allegations that it bribed officials to win contract for 43km stretch of toll road linking Moscow to St Petersburg.