The UK will invest extra money to tackle the problems caused by migrants at Calais attempting to cross the Channel.
Home Secretary Theresa May and her French counterpart Bernard Cazeneuve agreed to increase the joint intervention fund to improve security around the port and the Channel Tunnel.
The Home Office would not comment on how much extra money would be committed to the fund.
The announcement came as travel chaos continued as a result of the industrial action by French ferry workers.
Lorry drivers have been left languishing in miles of queues in Kent as it emerged that the ongoing strike was costing the UK economy more than £250 million a day.
More than 3,000 truckers were parked on the M20 in Kent for a fourth day as the partial closure of the Port of Calais continued to cripple Channel crossings.
Migrants camped near the French port have been taking advantage of slow-moving and queuing traffic by trying to board UK-bound vehicles.
The UK agreed in September last year to pay five million euros a year for three years to a joint intervention fund.
Following talks on the escalating crisis, Mrs May and Mr Cazeneuve issued a joint statement setting out the plan to increase funding.
It said: "In light of the increased migration crisis in the Mediterranean and its repercussion on Calais, where there are currently 3,000 migrants, the two ministers decided to further strengthen co-operation, notably by increasing the intervention fund.
"This will enable the installation of additional essential arrangements to prevent access to the port via the beach, but also to secure access to the Channel Tunnel, where incidents have taken place repeatedly over the past weeks.
"In this context, the two ministers emphasised the importance of a rapid resumption of maritime and rail traffic, which is indispensable to economic development on both sides of the Channel.
"In addition, joint information campaigns to inform migrants of the reality of Great Britain's asylum and benefits system for migrants, to reduce the flow of migrants to Calais, will be continued and strengthened."