Russia increased its stock of long-range missiles faster than expected, report says. It could spell a hard winter for Ukraine.

• Russia is renewing its missile stocks faster than expected. 
• It boosted its missile stocks by 285 since August, a think tank said.  
• Russia is expected to attack Ukraine's infrastructure over winter. 

Russia increased its stock of long-range missiles despite Western sanctions designed to bite into its ability to produce them, a think tank said.